1.Three triads 2.136 3.(i)The law succed only upto calcium element not further it (ii)There were no arrangement to add new discovered elements as Newland think that only 54 elements can be possible. Note: -2 Que explained , as if they are triads b=a+c/2 88 =40+c/2 88×2=40 + c 176 = 40 + c 176 - 40 =c 136=c... That 's all.
Q1) Dᴏʙᴇʀᴇɪɴᴇʀ ɪᴅᴇɴᴛɪғɪᴇᴅ 3 ᴛʀɪᴀᴅs ✓ Lɪ , Na , K ✓Ca ,Sr , Ba ✓Cl ,Br, I Q2 ) 40+ x/ 2= 88 x = 136 Q3) • it was valid for lighter elements i.e upto calcium (Ca) • He placed two elements in a single group (slot)eg: (Co , Ni) ; also the properties of Co and Ni were not matching in which he had placed with cl , br , I etc Thnku sir for giving us hw 💯
Hi sir ,you are the best teacher , And the answers for the homework questions are : I) Dobereiner was only able to identify 3 triads . ii) we know that (element A+element C)/2 = elements B (40+C )/2=88 40+C=88*2 40+C=176 C=176-40 C=136 Therefore answer is 136 iii) 2 issues in Newlands octaves were : a)it was only applicable till element calcium . b)newland assumed that only 56 element will exist and no another element will be found in future , but later when new element were discovered Newlands law of octaves became completely irrelevant BUT HIS LAW WORKED VERY WELL IN ELEMENTS CONTAINING LIGHT ATOMIC MASS.......... SIR THANKS A LOT FOR AN EXTODINARY SESSION .....
One of the best teacher I never seen sir. Thank u sir for providing some classes freely. Q 1. 3 Q 2. 136 Q 3. It is suitable upto calcium And two elements in one box
I was trying to help my son with the chapter. Stumbled on this video accidentally. Found it very helpful. Most striking thing is that it is explained in a very simple manner. Excellent work Mr_____. Sorry, don't know your name.
1) 3 triads 2) A+C/2=B 40+C/2=88 40+C=88×2 C=176-40=136 3)He plced two elements in the same slot The Newlands law of octaves is only valid till calcium
1) 3 2)A+C/2=B 40+C/2=88 40+C=88×2 40+C=176 C=176-40 C=136 3)i. He kept two elements in same slot ii.his law was only applicable for 56th element that is calcium ii.
Q1. 3 Q2. Approximately 136, because: (A + C)/2 = B Hence (40 + C) = 88 * 2 40 + C = 176 C = 176 - 40, Hence *C = 136* Q3. i. It only was applicable till calcium. ii. It put two elements in one box. iii. It only took into account the 56 elements that were then discovered, and when more were discovered, many elements could not be fit into the table.
Ans 1. Dobereiner identified 3 triads Ans 2. 136 Ans 3. (i) It was applicable only till calcium (ii)cobalt and nickel were placed with elements like hydrogen, fluorine, chlorine, bromine, etc whose chemical properties are very different from that of cobalt and nickel
My answer! Q1. Three traids, (average of atomic mass of 1st and 3rd element is approximately equal to the atomic mass of 2 ND element . ) Q2. We know that, average of atomic mass of 1st and 3rd element is approximately equal to the atomic mass of 2 ND element in order, let us assume C to be x, thus, (A+x)/2=88, (40+x)/2=88 or, 40+x=176,or, x=136u Atomic mass of c is 136u Q3. The two issues were - the table could be valid for the lighter elements till calcium (Ca) . There were only 56 elements discovered till that time (1866) but after the exploration of new elements caused issues and demerits of NewLands table. Edit : Thanks a lot! You are a true teacher 🙏🙏 You helped me memorising full book of science in a month.
Sir thank you so much I was crying for my tomorrow's chemistry exam....... My senior suggested this UA-cam channel........ Thanks a lot sir..... I'll share this channel in my class sir.... Once again thanks for infinity times......
Answers: 1)Dobereiner identified 3 triads 2)Let us assume C=x Given A=40,B=88 According to question, A+C/2=B =>40+x/2=88 =>40+x=2x88 =>40+x=176 =>x=176-40 =>x=136 Thus, the atomic mass of the element C is 136 For checking, A+C/2=B =>40+136/2=88 =>176/2=88 =>88=88 Thus, L.H.S=R.H.S. 3)The 2 issues are: i)Newland thought that there were only 56 elements in nature. ii)The Law of Octaves was only applicable up to Calcium(Ca). I hope, that I have given the right answers.. I am from West Bengal..
Q1. 3 Q2. (40+x)/2 = 88 x = 136 Q2. a)The classification worked only on the first 20 elements. b)Newland adjusted two elements cobalt and nickel in the same slot and these were placed in the same column as fluorine, chlorine and bromine which have very different properties from co and ni.
A1-3 triads A2-136 A3-in the time of newland there were only 53 elements, and when new elements are discovered the properties of those new elements didn't match.......... Sir the concept is crystal clear to me Thank you sir.
2 nd answer is 136 let element C be x then , (40+x)/2 = 88 40 + x = 88 multiplied by 2 = 176 .'. x = 176 - 40 = 136 I came across various answers regarding this question , that's why I decided to write this comment along with its necessary steps . if u again put value 136 as x and again do the equation to check the answer you'll get as 88 . HOPE THIS HELPS 😌
1 - 3 Triads 2 - 136 is the At. Mass of element ' C ' 3 - a) Newland's law of octave worked quite well for the lighter elements but did not work with heavier elements , i.e., those lying beyond Calcium. b) he adjusted 2 elements , Co & Ni in the same slot & these were placed in the same coloumn/group as Fluorine , Chlorine , & Bromide which have very different properties than these elements
Now it is exams time so I didn't understand the concept related to this..And I searched in youtube and found ur video... It's really easy for me now..Thank u
1) Dobereiner had 3 triads 2) my guess the third c is 137 because 137+40 is 177 so 177/2 is 88.5 average B is 88. 3)a)there are two elements in one slot. b) There are only 56 elements in Newlands laws and the property in which 1st elements property is same as 8th elements property didn't continue the in the other elements.
Q.1 dobereiner identified only 3 triads 0.2 atomic mass of 3rd element is 64 Q.3 1 issue: The table was only valid till calcium. 2 issue was: he assumed that there are only 56 elements there in nature Lastly i would really thank you for explaining this topics in a simple way i really loved ur explanation I have test today i was really confuses of this topics..But now i am crystal clear.. Thanks for your big support 🤩
Q1. 3 traids Q2. 136 Q3. The limitations of Newlands law of octave are. i. The table was only valid till calcium ii.he assumed that there are only 56 elements in nature. iii.he put two elements in one slot.
Super! All your answers are correct :) You can also try the Quiz for this video on my Website: www.manochaacademy.com/chapters/34/lessons/36 . Quiz button is below the video.
These are the answers for your questions sir 1 -3 2-40+88/2 is equal to 64 3- it is worked for only lighter elements till ca he assumed only 56 elements in nature Thank you sir this helped me a lot thank q..
@@gooooooooooooooooooooooo i have not perfect reason why this wrong but 40 is also in division so we can't directly move one value. either we move whole numerator to right side or denominator.
Q1. He identified 3 Triads Q2. C=64 Q3. a. He put two elements in one spot. b. Newland assumed that there are only 56 elements in nature. c. Only valid till calcium (CA).
Q.1 Dobereiner identified 3 triads Q.2 A+C/2=88 40+C/2=88 C/2=88-40 C/2=48 C=48×2 C=96 Q.3 2 issues with newlands law of octaves were that: (i) He stated that only 56 elemenys existed in nature and no more were to be found. (ii) Fe was placed far away from Co and Ni whereas they have similar properties. (iii) The Law of octaves was applicable only till Ca.
One thing which is awesome about you is you never post very long duration videos...well I easily get bored while watching long duration videos😅so I prefer your videos for understanding several topics...thank you sir
1. 3 triads 2. let the atomic mass of the third element be x therefore, A/Q, ___40+x___ = 88 2 => 40 +x = 88 *2 => x= 176 - 40 = 136 therefore the atomic mass of the third element is 136 3.two issues with Newland's law of octaves are: a) he grouped elements having different chemical properties together and elements having similar chemical properties far away. b) he thought that only 56 elements existed in nature and no other elements would be found later in the future.
Super!! All your answers are correct :) Also try the Quiz for this video: www.manochaacademy.com/chemistry/periodic-classification-of-elements/l/triads-and-octaves
Top 3 Questions {My Answers} 1) Dobereiner identify 3 Triads. #Lithium , Sodium , Potassium. #Chlorine , Bromine , Iodine. #Calcium , Scrontium (In book) and Barium. 2)B = A+C/2 = B×2-A= C => 88×2-40 = 176-40 = 136 3)Drawbacks of Newland's Law of Octaves : #In the place of one element , he placed two elements. #His law can only acceptable to lighter elements. #He placed Iron {Fe} in a wrong place , which means Fe cannot be have the same chemical properties of other eight elements on the table. Eagerly waiting for your Reply Comment Sir.
it is intersting vidio and thank you for your explanation Top 3 question concerning about periodic table Q1 Three B/c law of triads means 3 elements Q2 according to Doberner law the atomic mass of the middle element is the avarage of the frist and the therd incas atomic mass ofA+atomic mass of C divided by two gives B massB=massA+massC/2 88=40+mass C/2 88×2=40+massc Mass of C=88×2-40 136g/mole Q3 1)He pleaced two elements in one place 2) the law applicable for only light element
Happy to hear that you liked the video! Thanks :) Very good! Answers of Q2 and Q3 are correct!! Q1 answer is 3 because Dobereiner could identify only 3 groups (triads) at that time (see the 3 triads in the video). Each triad contains 3 elements. Also try the Quiz for this video on my Website. Quiz button is below the video: www.manochaacademy.com/chemistry/periodic-classification-of-elements/l/triads-and-octaves
Answers: 3 triads 136 Worked only for the elements till Calcium; he assumed that there were only 56 elements in nature, so all the elements which came after that did not fit in the table Thank you so much! your videos are helping a lot during this lockdown...
Q1 = 3triads Q2 = 136u Q3 = it was applicable till calcium and Co and Ni are placed in column of F , Cl and Br which is not having similar properties And Thank you sir ☺️☺️
Sir you are my favorite teacher all your video are fantastic all concepts of newland law of octaves and Dobereiner's triads are clear to me THank you so much sir !
Q.1 = 3 Traids, Q.2 = 136, and Q.3 = Newlands assumed that there are only 56 elements in nature, only valid till Calcium (Ca), put two elements in one slot like Co and Ni and Ce and La which were not supposed to be in it........ answer from Tanaaz.J
I love your your teaching very much sir. Its very easy to understand your classes than our teachers teach. Thank you very much sir, Q 1:- 3 triads Q 2:- 136 is the atomic number of element C Q 3:- 1 - Newland's laws of octaves rule is only correct upto Calcium and 2 - he placed two elements in one box Ex:- Cobalt and Nickel & Cerium and Lanthanum in one box.
I had never seen such perfect explaintion in any video of you tube awesome sir you are very talented and know how to express own knowledge....awesome sir thank you so much sir.....💝💝💝💝💝💝😘🇮🇳👍
Q1 - 3 triads Q2 - C=136 Q3 - 1=only valid till Ca(calcium) 2=he assumed that there are only 56 elements in nature and when more elements has been discovered, they did not fit the newland's law of octave.
Sir i am child of class 10.when my teacher take this lesson I don't understand and in the mid term exam I simply sitting on exam hall. When I saw this class it is wonderful. It was a nice by manocha sir. Keep upload more lessons. Faithfully thank you
Q1 3 Q2 136 Q3 upto calcium there was only applicable of resembling eigth element And There were cobalt and nickhel in the 1st slot, which does not has the propeety of that slot
Q1.there were only 3 triads Q2.Z of C element is136 Q3. 1.this law is only valid till calcium 2.Newlands had designed his octave table for only 56 elements but after this table many elements had discovered for that discovered elements octave rule is not suitable Please check my answers whether these are correct
Answer: 1) 3 triads 2) 136 is atomic mass 3)A) Laws of octaves worked well till calcium only, B) Newlands assumed that only 56 element existed in nature, but new element came up and doesn't fit into law of octaves.
1. Dobereiner could identify 3 triads. 2. I got the answer as 136 3. the laws or properties stated were followed until calcium, two elements were added together in one slot and iron (Fe) which is related to these elements was situated very far. Also later when more elements were found, even they couldn't fit in the table.
Q1-Dobereiner identified only 3 triads Q2-In order to find the atomic mass of the third element we need to use the following equation; [40+c]/2=88 40+c=88x2 c=176-40 c=136 Q3-The first issue was that it was only valid till calcium and the second issue was that it wont be able to fit in the elements that were discovered later on
Perfect explanation... thankyou sir!! 1) 3 triads 2) 136 3) two elements were placed in the same column and also those elements differed from the other elements in the column in its properties. And the table was valid only for lighter elements until Calcium ..Newland assumed that only 56 elements existed in nature,which was wrong .
1. 3 traids 2. C-136 3. Newlands law of octaves only applicable up to calcium. Newlands assumed there are only 56 elements in nature but later new elements were discovered which is not fit into law of octaves.
1.)He found 3 triads among the elements known at that time. 2.)C = 136 3.)(a)Newlands law of octaves worked only upto calcium.(b) He placed two elements in the some boxes in order to match the properties.(c) He did not keep place for the new discovered elements.
Q1: The no of triads identified by dobereiner was 3 Q2 average of A and B = Atomic mass of C 40+88/2=128/2=64 Q3 1. Newland law of octaves was only applicable till calcium 2. At that time only 56 elements were known so the Newland law of octaves was applicable only till the 56th element. It worked well only with lighter elements which is till calcium.
1-5 2-(40/2+x/2=88)=(x/2=88-40/2)=(x/2=68)=(x=68×2)=(x=136)• 3-it was found that the law of octaves holds good only for the elements up to calcium.Sertain elements, totally dissimilar in there properties,were fitt into the same group.
@@DharmendraSingh-rh2wr well in the question it is given the atomic mass of the first and 2nd element is 40 and 88 respectively, And we know that the average of 1st and 3rd element is approximately equal to the 2nd element, triad. we can form an equation by this that is, 40+ 3rd element(C) divided by 2 is equal to 88 40 + C = 172 after taking the 2 Otherside now just send 40 to other side, subtract it from 172-40 = 136 therefore C= 136. I hope this will help you to understand.
Answers for the top three questions. 1. He identified three triads. 2. 136. Working => 88=40+C/2 ---> 88 x 2 = 40 + C -----> 176 = 40 + C -----> C = 176 - 40 = 136. 3. These laws were valid only till Calcium. Dissimilar elements were fitted into the same slot.
Q.1....3 Q.2....136 Q.3....(i) only valid till calcium (ii) he assumed that there are only 56 elements in nature. (iii) he has arranged two elements in one box.
1. Do Re Mi Fa So La Ti Do - Tonal scale for Do 2. Sa Re Ga Ma Pa Da Ni Sa - Carnatic scale for Sa 3. C D E F G A B C - Western scale for C Major. 4. M T W Th F Sa Su M - Days in a week You can chose the type you like. i choose the third one because I've been learning western music since childhood.
3 Triads Atomic Mass of The element c is 136 Issues with law of octaves:- Only applicable till Calcium, He fitted two elements in 1 place THANK YOU SIR!!!! YOU EXPLAIN WELL
Q1 3 triads only Q2 64u [as you have said that in the triads the average of 1st and 3rd is approximately equal to atomic mass of 2nd element] Q3 {a} Newlands thought that there were only 56 elements in the nature which was a false statement when further research took place . {B} his theory of octaves stood true for only lighter element till calcium
Hey friends😀! I think most of the one have done mistake in 2 questions the answer is 136 not 64 because the second element is the average of 1st and third element according to the question they gave 1st and second so we have to make some changes in the formula B=A+C/2 C=2B-A ON SUBSTITUTING WE GET C= 136
@@keerthanakeerthi5713 if there are three elements according to the question the three elements are A,B,C according to Döbereiner he said that in a triad the 2nd element according to question it is B the atomic mass of B is approximately equal to the average of the first and third element atomic mass which is A and C in the question they gave the atomic mass for the elements A and B and they asked us to find C's atomic mass so the formulas for finding average is B=A+C/2 so we should derive the formula, 2B=A+C A+C=2B C=2B-A -----(1) ON SUBSTITITUTING ON EQUATION (1) WE GET C=2(88)-40 C=176-40 C=136 HOPE YOU UNDERSTOOD😄 IF YOU HAVE ANY DOUBTS ABOUT MY EXPLANATION PLS ASK I AM READY TO ANSWER
Dobereiner identify 3 triads 2) the 3rd element atomic mass is 64 3) Hydrogen was not included in this sequence Noble gases were also not included in this classification
1) Dobereiner discovered 3 traids 2) C will be 136 calculation :: (40+c)÷2=88 40+c=176 So ; c=176-40 which is equal to 136 3) cobalt and nickel had put in the same slot that is in the column of F; Cl and Br which is very different from Co and Ni And newlands law of octaves is valid Only upto Ca beyond Ca it is not applicable
Answers.. 1. Three triads 2. The atomic mass of third element is 136.. 3. Some issues to the law of octaves are.. ● It was not applicable after the element named Ca. ( applied to only lighter elements) ● Newland think thet there are 56 elements and when several new elements discovered, their properties didnot match with law of octaves. ● Newland put two elements in one slot which quite not the correct manner in classifying elements. Hey sir. Thnx alot for the session... If there is any error in my and let me know and I will correct it..🙏🙏
1. 3 triads 2. 136 3. (i) Newland's law of octave act true only for elements up to Ca . (ii)The elements that were discovered later could not be fit into the pattern.
1ans = 3 trafis 2ans = 136 is c 3ans = 1.every 8th elements starting from a given elements resembles in its properties to that of starting element. Elements are in horizontal row 2.every period starts nitha new she'll and ends when the shell is filled.newland's laws of octaves is similar to octet configuration
1.Three triads
2.136
3.(i)The law succed only upto calcium element not further it
(ii)There were no arrangement to add new discovered elements as Newland think that only 54 elements can be possible.
Note: -2 Que explained , as if they are triads
b=a+c/2
88 =40+c/2
88×2=40 + c
176 = 40 + c
176 - 40 =c
136=c...
That 's all.
Q1) Dᴏʙᴇʀᴇɪɴᴇʀ ɪᴅᴇɴᴛɪғɪᴇᴅ 3 ᴛʀɪᴀᴅs
✓ Lɪ , Na , K
✓Ca ,Sr , Ba
✓Cl ,Br, I
Q2 ) 40+ x/ 2= 88
x = 136
Q3) • it was valid for lighter elements i.e upto calcium (Ca)
• He placed two elements in a single group (slot)eg: (Co , Ni) ; also the properties of Co and Ni were not matching in which he had placed with cl , br , I etc
Thnku sir for giving us hw 💯
Hi sir ,you are the best teacher ,
And the answers for the homework questions are :
I) Dobereiner was only able to identify 3 triads .
ii) we know that (element A+element C)/2 = elements B
(40+C )/2=88
40+C=88*2
40+C=176
C=176-40
C=136
Therefore answer is 136
iii) 2 issues in Newlands octaves were :
a)it was only applicable till element calcium .
b)newland assumed that only 56 element will exist and no another element will be found in future , but later when new element were discovered Newlands law of octaves became completely irrelevant
BUT HIS LAW WORKED VERY WELL IN ELEMENTS CONTAINING LIGHT ATOMIC MASS..........
SIR
THANKS
A
LOT
FOR
AN
EXTODINARY
SESSION .....
One of the best teacher I never seen sir. Thank u sir for providing some classes freely.
Q 1. 3
Q 2. 136
Q 3. It is suitable upto calcium
And two elements in one box
You are the best teacher on UA-cam i have found till now!
Thanks a lot :) Do check out my website : www.manochaacademy.com
Sir i am from kendriya vidyalaya. My science teacher sent this link to me for a good explanation. Thanks alot for your explanation.
You are most welcome
Lie
Why don't you brush your teeth Mr you teeth is in yellow color
@@senthilkumar8702 ravi?
@@senthilkumar8702 abe saale wo padha rhe hai to pad
I was trying to help my son with the chapter. Stumbled on this video accidentally. Found it very helpful. Most striking thing is that it is explained in a very simple manner. Excellent work Mr_____. Sorry, don't know your name.
Glad it helped! My name is Sandeep Manocha
@@ManochaAcademysir I know that manocha but now I got to know that before manocha Snadeep is their
@@ManochaAcademy how to find out 2 question
Let him study himself idiot.. he is in 10th std
@@firegamingadi4010 Its easy
Just add 40 and 88
40+88/2 = 64
Hope it helped
1) 3 triads
2) A+C/2=B
40+C/2=88
40+C=88×2
C=176-40=136
3)He plced two elements in the same slot
The Newlands law of octaves is only valid till calcium
1) 3
2)A+C/2=B
40+C/2=88
40+C=88×2
40+C=176
C=176-40
C=136
3)i. He kept two elements in same slot
ii.his law was only applicable for 56th element that is calcium
ii.
Q1. 3
Q2. Approximately 136, because:
(A + C)/2 = B
Hence (40 + C) = 88 * 2
40 + C = 176
C = 176 - 40,
Hence *C = 136*
Q3.
i. It only was applicable till calcium.
ii. It put two elements in one box.
iii. It only took into account the 56 elements that were then discovered, and when more were discovered, many elements could not be fit into the table.
Ans 1. Dobereiner identified 3 triads
Ans 2. 136
Ans 3. (i) It was applicable only till calcium
(ii)cobalt and nickel were placed with elements like hydrogen, fluorine, chlorine, bromine, etc whose chemical properties are very different from that of cobalt and nickel
My answer!
Q1. Three traids, (average of atomic mass of 1st and 3rd element is approximately equal to the atomic mass of 2 ND element . )
Q2. We know that, average of atomic mass of 1st and 3rd element is approximately equal to the atomic mass of 2 ND element in order, let us assume C to be x, thus, (A+x)/2=88, (40+x)/2=88 or, 40+x=176,or, x=136u
Atomic mass of c is 136u
Q3. The two issues were - the table could be valid for the lighter elements till calcium (Ca) .
There were only 56 elements discovered till that time (1866) but after the exploration of new elements caused issues and demerits of NewLands table.
Edit : Thanks a lot! You are a true teacher 🙏🙏 You helped me memorising full book of science in a month.
Sir thank you so much
I was crying for my tomorrow's chemistry exam.......
My senior suggested this UA-cam channel........
Thanks a lot sir.....
I'll share this channel in my class sir....
Once again thanks for infinity times......
Most welcome
Answers:
1)Dobereiner identified 3 triads
2)Let us assume C=x
Given A=40,B=88
According to question,
A+C/2=B
=>40+x/2=88
=>40+x=2x88
=>40+x=176
=>x=176-40
=>x=136
Thus, the atomic mass of the element C is 136
For checking,
A+C/2=B
=>40+136/2=88
=>176/2=88
=>88=88
Thus, L.H.S=R.H.S.
3)The 2 issues are:
i)Newland thought that there were only 56 elements in nature.
ii)The Law of Octaves was only applicable up to Calcium(Ca).
I hope, that I have given the right answers..
I am from West Bengal..
👏
🎉
Q1. 3
Q2. (40+x)/2 = 88
x = 136
Q2. a)The classification worked only on the first 20 elements.
b)Newland adjusted two elements cobalt and nickel in the same slot and these were placed in the same column as fluorine, chlorine and bromine which have very different properties from co and ni.
Calcium was the 17th element at that time
A1-3 triads
A2-136
A3-in the time of newland there were only 53 elements, and when new elements are discovered the properties of those new elements didn't match.......... Sir the concept is crystal clear to me Thank you sir.
A3 - It's 56 elements not 53 elements dude
Sir ....frm u...am really become a good speaker....in English much better than before.... because u teach as excellent as u speak.....
Glad to hear that. Keep watching and do share with your friends
Mee too....
Chip laudi
@@thegreatgamer2236 jio sheraaa😂😂😂
2 nd answer is 136
let element C be x then ,
(40+x)/2 = 88
40 + x = 88 multiplied by 2
= 176
.'. x = 176 - 40
= 136
I came across various answers regarding this question , that's why I decided to write this comment along with its necessary steps . if u again put value 136 as x and again do the equation to check the answer you'll get as 88 .
HOPE THIS HELPS 😌
Thank you so much for the explanation. ❤️
1 - 3 Triads
2 - 136 is the At. Mass of element ' C '
3 - a) Newland's law of octave worked quite well for the lighter elements but did not work with heavier elements , i.e., those lying beyond Calcium.
b) he adjusted 2 elements , Co & Ni in the same slot & these were placed in the same coloumn/group as Fluorine , Chlorine , & Bromide which have very different properties than these elements
Now it is exams time so I didn't understand the concept related to this..And I searched in youtube and found ur video...
It's really easy for me now..Thank u
It's my pleasure
1) Dobereiner had 3 triads
2) my guess the third c is 137 because 137+40 is 177 so 177/2 is 88.5 average B is 88.
3)a)there are two elements in one slot.
b) There are only 56 elements in Newlands laws and the property in which 1st elements property is same as 8th elements property didn't continue the in the other elements.
Q.1 dobereiner identified only 3 triads
0.2 atomic mass of 3rd element is 64
Q.3 1 issue: The table was only valid till calcium.
2 issue was: he assumed that there are only 56 elements there in nature
Lastly i would really thank you for explaining this topics in a simple way i really loved ur explanation
I have test today i was really confuses of this topics..But now i am crystal clear..
Thanks for your big support 🤩
Q1. 3 traids
Q2. 136
Q3. The limitations of Newlands law of octave are.
i. The table was only valid till calcium
ii.he assumed that there are only 56 elements in nature.
iii.he put two elements in one slot.
Yes you are right bro in the second question.
Most of the students are writing 5
64 but these dumbs didn't understand the question properly.
Q1. Three
Q2. (40+x)/2=88
40+x=176
×=136
Atomic mass of 3rd element is 136.
Q3. Only valid upto Ca and
He assumed that elements are 56 in nature
Super! All your answers are correct :) You can also try the Quiz for this video on my Website: www.manochaacademy.com/chapters/34/lessons/36 . Quiz button is below the video.
These are the answers for your questions sir
1 -3
2-40+88/2 is equal to 64
3- it is worked for only lighter elements till ca he assumed only 56 elements in nature
Thank you sir this helped me a lot thank q..
B = A+C/2
so
B x 2 = A+C
88x2 = 40 + C
176 - 40 = C
Hence, C = 136
@@adarshraj4696 yess but I did like
40+c/2=88
So 88-40=c/2
48*2=c
C=96
Is this right 🥲
@@gooooooooooooooooooooooo i have not perfect reason why this wrong but 40 is also in division so we can't directly move one value. either we move whole numerator to right side or denominator.
@@gooooooooooooooooooooooo no broh!..
We can't take the 40 like that
Q1. He identified 3 Triads
Q2. C=64
Q3. a. He put two elements in one spot.
b. Newland assumed that there are only 56 elements in nature.
c. Only valid till calcium (CA).
answer in 136 for the 2nd one
Q.1 Dobereiner identified 3 triads
Q.2 A+C/2=88
40+C/2=88
C/2=88-40
C/2=48
C=48×2
C=96
Q.3 2 issues with newlands law of octaves were that:
(i) He stated that only 56 elemenys existed in nature and no more were to be found.
(ii) Fe was placed far away from Co and Ni whereas they have similar properties.
(iii) The Law of octaves was applicable only till Ca.
One thing which is awesome about you is you never post very long duration videos...well I easily get bored while watching long duration videos😅so I prefer your videos for understanding several topics...thank you sir
Thank you so much 😀
1. 3 triads
2. let the atomic mass of the third element be x
therefore, A/Q,
___40+x___ = 88
2
=> 40 +x = 88 *2
=> x= 176 - 40 = 136
therefore the atomic mass of the third element is 136
3.two issues with Newland's law of octaves are:
a) he grouped elements having different chemical properties together and elements having similar chemical properties far away.
b) he thought that only 56 elements existed in nature and no other elements would be found later in the future.
Super!! All your answers are correct :) Also try the Quiz for this video: www.manochaacademy.com/chemistry/periodic-classification-of-elements/l/triads-and-octaves
here what is the meaninig of A/Q?
A/Q means according to question
2Q) A=40, B=80, and C=x
A+C÷2=B
40+x÷2=88
40+x=88×2
40+x=176
×=176 - 40
=136 simple answer
You teach the various concepts practically hence we can understand easily
Thanks a lot :)
@@ManochaAcademy sir Hindi me bhi bolo
Ans .1 = 3 triads
Ans .2 = 64
Ans .3 = a) = only valid till calcium
b)= put two elements in one slot .
Amazing explanations .👏
Top 3 Questions {My Answers}
1) Dobereiner identify 3 Triads.
#Lithium , Sodium , Potassium.
#Chlorine , Bromine , Iodine.
#Calcium , Scrontium (In book) and Barium.
2)B = A+C/2 = B×2-A= C => 88×2-40 = 176-40 = 136
3)Drawbacks of Newland's Law of Octaves :
#In the place of one element , he placed two elements.
#His law can only acceptable to lighter elements.
#He placed Iron {Fe} in a wrong place , which means Fe cannot be have the same chemical properties of other eight elements on the table.
Eagerly waiting for your Reply Comment Sir.
👏👏👏
It's strontium.... I think ur book is wrong... Good answers...
it is intersting vidio and thank you for your explanation
Top 3 question concerning about periodic table
Q1 Three B/c law of triads means 3 elements
Q2 according to Doberner law the atomic mass of the middle element is the avarage of the frist and the therd incas
atomic mass ofA+atomic mass of C divided by two gives B
massB=massA+massC/2
88=40+mass C/2
88×2=40+massc
Mass of C=88×2-40
136g/mole
Q3 1)He pleaced two elements in one place
2) the law applicable for only light element
Happy to hear that you liked the video! Thanks :)
Very good! Answers of Q2 and Q3 are correct!!
Q1 answer is 3 because Dobereiner could identify only 3 groups (triads) at that time (see the 3 triads in the video). Each triad contains 3 elements.
Also try the Quiz for this video on my Website. Quiz button is below the video: www.manochaacademy.com/chemistry/periodic-classification-of-elements/l/triads-and-octaves
Answers: 3 triads
136
Worked only for the elements till Calcium; he assumed that there were only 56 elements in nature, so all the elements which came after that did not fit in the table
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Minblowing 🎉🙏 keep going sir
Thanks for liking
Q1 = 3triads
Q2 = 136u
Q3 = it was applicable till calcium and Co and Ni are placed in column of F , Cl and Br which is not having similar properties
And Thank you sir ☺️☺️
Sir you are my favorite teacher all your video are fantastic
all concepts of newland law of octaves and Dobereiner's triads are clear to me
THank you so much sir !
Keep watching
Q.1.3
2.137
3.i-Only valid till calcium
ii-Put 2 elements in one slot.
Excellent sir and thank you
Q.1 = 3 Traids, Q.2 = 136, and Q.3 = Newlands assumed that there are only 56 elements in nature, only valid till Calcium (Ca), put two elements in one slot like Co and Ni and Ce and La which were not supposed to be in it........ answer from Tanaaz.J
I love your your teaching very much sir. Its very easy to understand your classes than our teachers teach. Thank you very much sir,
Q 1:- 3 triads
Q 2:- 136 is the atomic number of element C
Q 3:- 1 - Newland's laws of octaves rule is only correct upto Calcium
and 2 - he placed two elements in one box
Ex:- Cobalt and Nickel & Cerium and Lanthanum in one box.
Sodium(Na) was the 9th element at that time (Newland's laws of octaves)
Sir you are the best teacher
Thanks
Yeah bro..
I had never seen such perfect explaintion in any video of you tube awesome sir you are very talented and know how to express own knowledge....awesome sir thank you so much sir.....💝💝💝💝💝💝😘🇮🇳👍
@harshad dhanke, Thanks a lot :)
Q1 - 3 triads
Q2 - C=136
Q3 - 1=only valid till Ca(calcium)
2=he assumed that there are only 56 elements in nature and when more elements has been discovered, they did not fit the newland's law of octave.
Sir i am child of class 10.when my teacher take this lesson I don't understand and in the mid term exam I simply sitting on exam hall. When I saw this class it is wonderful. It was a nice by manocha sir. Keep upload more lessons. Faithfully thank you
Sir I had an head ach when I had a test I saw your vedios and got a clarity
THANKS SIR 👌
🙏
It's my pleasure
Thanks a lot sir 🙏🙏
Q1. Three triads
Q2. 136
Only valid till Calcium
He assumed that there were only 56 elements in nature
He put two elements in one slot
This concept is really difficult sir but u taught very easier........thank u sir🥰 keep rocking sir
Most welcome 😊
@@ManochaAcademy s sir
Q1 3
Q2 136
Q3 upto calcium there was only applicable of resembling eigth element
And
There were cobalt and nickhel in the 1st slot, which does not has the propeety of that slot
Q1.there were only 3 triads
Q2.Z of C element is136
Q3. 1.this law is only valid till calcium
2.Newlands had designed his octave table for only 56 elements but after this table many elements had discovered for that discovered elements octave rule is not suitable
Please check my answers whether these are correct
Answer:
1) 3 triads
2) 136 is atomic mass
3)A) Laws of octaves worked well till calcium only,
B) Newlands assumed that only 56 element existed in nature, but new element came up and doesn't fit into law of octaves.
😃
1. Dobereiner could identify 3 triads.
2. I got the answer as 136
3. the laws or properties stated were followed until calcium, two elements were added together in one slot and iron (Fe) which is related to these elements was situated very far. Also later when more elements were found, even they couldn't fit in the table.
Sir your explanation clears all my doubts. Sir really you're awesome 👌👌👌👌
So nice of you
@@ManochaAcademy Hindi bhi plzzz
Your practical version is super cool then other youtubers lecture
Thanks for liking
Q1-Dobereiner identified only 3 triads
Q2-In order to find the atomic mass of the third element we need to use the following equation;
[40+c]/2=88
40+c=88x2
c=176-40
c=136
Q3-The first issue was that it was only valid till calcium and the second issue was that it wont be able to fit in the elements that were discovered later on
Perfect explanation... thankyou sir!!
1) 3 triads
2) 136
3) two elements were placed in the same column and also those elements differed from the other elements in the column in its properties. And the table was valid only for lighter elements until Calcium ..Newland assumed that only 56 elements existed in nature,which was wrong .
Nothing to say.......except fabulous explaination....... ❤️
Thanks
You Have Best Teaching Way And Excellent Explaining With Your Vdo
Great to hear that you liked the video :) Thanks a lot!! Do check out more videos at www.manochaacademy.com
1. 3 traids
2. C-136
3. Newlands law of octaves only applicable up to calcium. Newlands assumed there are only 56 elements in nature but later new elements were discovered which is not fit into law of octaves.
with this video all my queries are all solved ..........
Thank you sir . Now I can score good marks in my test.....
thank you so much ..
Thanks sir for your wonderful explanation I will definitely share this video to my friends also
Always welcome
1.)He found 3 triads among the elements known at that time.
2.)C = 136
3.)(a)Newlands law of octaves worked only upto calcium.(b) He placed two elements in the some boxes in order to match the properties.(c) He did not keep place for the new discovered elements.
Q1: The no of triads identified by dobereiner was 3
Q2 average of A and B = Atomic mass of C
40+88/2=128/2=64
Q3 1. Newland law of octaves was only applicable till calcium
2. At that time only 56 elements were known so the Newland law of octaves was applicable only till the 56th element. It worked well only with lighter elements which is till calcium.
1-5
2-(40/2+x/2=88)=(x/2=88-40/2)=(x/2=68)=(x=68×2)=(x=136)•
3-it was found that the law of octaves holds good only for the elements up to calcium.Sertain elements, totally dissimilar in there properties,were fitt into the same group.
Q1 3 triads
Q2 136
Q3 There were mainly 3 issues found with Newland's law of octaves
1 only valid till calcium
2 there is 2 element in one slot
Please explain me Q2
@@DharmendraSingh-rh2wr well in the question it is given the atomic mass of the first and 2nd element is 40 and 88 respectively, And we know that the average of 1st and 3rd element is approximately equal to the 2nd element, triad. we can form an equation by this that is,
40+ 3rd element(C) divided by 2 is equal to 88
40 + C = 172 after taking the 2 Otherside
now just send 40 to other side, subtract it from 172-40 = 136
therefore C= 136. I hope this will help you to understand.
@@nafiz_mk bro 88×2 is 176, maybe you wrote 172 by mistake
@@xfganchu yep😂
@@nafiz_mk Thanks 💝
1.3
2.136
3.•only valid till calcium
•two element are placed in one slot
•newland's assumed that there are only 56 elements in nature
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Great
@@ManochaAcademy sir u did not reply to the answers.......
Answers for the top three questions.
1. He identified three triads.
2. 136. Working => 88=40+C/2 ---> 88 x 2 = 40 + C -----> 176 = 40 + C -----> C = 176 - 40 = 136.
3. These laws were valid only till Calcium.
Dissimilar elements were fitted into the same slot.
Q.1....3
Q.2....136
Q.3....(i) only valid till calcium
(ii) he assumed that there are only 56 elements in nature.
(iii) he has arranged two elements in one box.
A1. He identified 3 triads
A2. 136
A3. Problem 1: Some elements are in one slot
Problem 2: It doesn't work for all elements which are discovered later
Sir because of your excellent teaching our school is providing your videos in lockdown...
Thanks a lot sir🙏👌👌👍
It's my pleasure
Sir I am very thankful for this video it is helping me very much
In our school I listened it's
not understood by me
Thanks teacher keep going from somalia one love
Happy to hear that you liked the video! Thanks :)
Sir ur teaching is simply superb and I subscribed only ur channel in you tube ....thank you sir..
Thanks and welcome
☺
THANK YOU SIR.....I WAS ABLE TO UNDERSTAND ONLY THROUGH YOUR VIDEOS
Glad to hear that
Tq sir😎
1. Ans- 3
2. Ans-136
3. Ans- The newland's law of octaves only resembles lighter elements.
He arranged two elements in same slot.
How to solve this please tell me
Please reply
🙏
A+C/2=B
40+C=88×2
C=176-40
C=136
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2. Sa Re Ga Ma Pa Da Ni Sa - Carnatic scale for Sa
3. C D E F G A B C - Western scale for C Major.
4. M T W Th F Sa Su M - Days in a week
You can chose the type you like. i choose the third one because I've been learning western music since childhood.
Super explinationn way i understand very very well thank u so much sir please do more videos don, t stop the way u helping like me many students
Keep watching
3 Triads
Atomic Mass of The element c is 136
Issues with law of octaves:-
Only applicable till Calcium, He fitted two elements in 1 place
THANK YOU SIR!!!! YOU EXPLAIN WELL
Sir I like your teaching
That I could understand every topic easily
Glad to hear that
Q1 3 triads only
Q2 64u [as you have said that in the triads the average of 1st and 3rd is approximately equal to atomic mass of 2nd element]
Q3
{a} Newlands thought that there were only 56 elements in the nature which was a false statement when further research took place .
{B} his theory of octaves stood true for only lighter element till calcium
Same here
Ans.1 3 traids were identified by Dobereiner.
Ans. 2 136 is atomic mass of C.
Ans. 3 1) 2 elements are put in one slot
2) only valid till calcium Ca
Hey friends😀! I think most of the one have done mistake in 2 questions the answer is 136 not 64 because the second element is the average of 1st and third element according to the question they gave 1st and second so we have to make some changes in the formula
B=A+C/2
C=2B-A
ON SUBSTITUTING
WE GET C= 136
Ur correct
u r correct dude
How we will get 136..iam not getting it..I was getting 64..can u tell me plz how would u get it..
In A,B,C they have given A(40), B (88) we should find C
A+C whole /2 is =B
40+C/2 =88
40+C=88×2
40+C=176
C=176-40
C=136
@@keerthanakeerthi5713 if there are three elements according to the question the three elements are A,B,C according to Döbereiner he said that in a triad the 2nd element according to question it is B the atomic mass of B is approximately equal to the average of the first and third element atomic mass which is A and C
in the question they gave the atomic mass for the elements A and B and they asked us to find C's atomic mass
so the formulas for finding average is B=A+C/2
so we should derive the formula,
2B=A+C
A+C=2B
C=2B-A -----(1)
ON SUBSTITITUTING ON EQUATION (1)
WE GET
C=2(88)-40
C=176-40
C=136
HOPE YOU UNDERSTOOD😄
IF YOU HAVE ANY DOUBTS ABOUT MY EXPLANATION PLS ASK I AM READY TO ANSWER
1. 3
2.136
3. It was a issue of an 56 elements but there were more discover of elements in future it was not fixed for his table
I like your teaching skill. And I shared your your channel's link to all my friends. Thanks for teaching in this way.. 🙂
Most welcome
I am a teacher and your videos has helped me a lot in my teaching process.
Dobereiner identify 3 triads
2) the 3rd element atomic mass is 64
3) Hydrogen was not included in this sequence
Noble gases were also not included in this classification
Thankyou for your time sir and your teaching skill make me your fan.
I am the biggest fan of yours.
You are the best teacher I ever seen.
It's my pleasure
1) Dobereiner discovered 3 traids
2) C will be 136 calculation :: (40+c)÷2=88
40+c=176
So ; c=176-40 which is equal to 136
3) cobalt and nickel had put in the same slot that is in the column of F; Cl and Br which is very different from Co and Ni
And newlands law of octaves is valid
Only upto Ca beyond Ca it is not applicable
Also he had assumed that only 56 will be there and no elements will be discovered later....
Yous explanation is super and I AM impressed 👍👍
You teaches very well sirr
Glad you are liking it.
Answers..
1. Three triads
2. The atomic mass of third element is 136..
3. Some issues to the law of octaves are..
● It was not applicable after the element named Ca. ( applied to only lighter elements)
● Newland think thet there are 56 elements and when several new elements discovered, their properties didnot match with law of octaves.
● Newland put two elements in one slot which quite not the correct manner in classifying elements.
Hey sir. Thnx alot for the session...
If there is any error in my and let me know and I will correct it..🙏🙏
just grammatical errors that's it... :)
@@balbirkaur5644 ?????????
1. 3 triads
2. 136
3. (i) Newland's law of octave act true only for elements up to Ca .
(ii)The elements that were discovered later could not be fit into the pattern.
1ans = 3 trafis
2ans = 136 is c
3ans = 1.every 8th elements starting from a given elements resembles in its properties to that of starting element. Elements are in horizontal row
2.every period starts nitha new she'll and ends when the shell is filled.newland's laws of octaves is similar to octet configuration
A) 3
B) 136
C) Only applicable till calcium and Two of the element were fitted in one place.
How uh found 2nd 's ans ?
@@kratigautam8073 just apply the formula.
I am in 10th std and I was very much tensed about this chapter but Manocha Academy made it really very simple
I Thank You sir
Answer 2nd is A=40 B=88 find C so that 40+88=128/2 = 64 the correct answer