Periodic Classification of Elements
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- Опубліковано 8 лют 2019
- Periodic Classification of Elements: Let's explore Dobereiner's Law of Triads and Newland's Law of Octaves in this video! In the history of the Periodic Table, these were the initial attempts to group elements. We also discuss why do we need to classify elements and the need of a Periodic Table in Chemistry.
Try the Top 3 Questions at the end of video and write your answers and doubts in the comments below!
Try Quiz for this video: www.manochaacademy.com/chapte...
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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.
You are the best teacher on UA-cam i have found till now!
Thanks a lot :) Do check out my website : www.manochaacademy.com
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 .....
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 💯
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.
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
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
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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.
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
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
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.
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..
👏
🎉
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. ❤️
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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
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Most welcome
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.
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.
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.
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
Thank you sir I like your way of teaching it was excellent
Thanks and welcome
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
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.
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
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@harshad dhanke, Thanks a lot :)
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@@ManochaAcademy sir Hindi me bhi bolo
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
Sir , please make the video on mendeleev 's & modern periodic table pllllllllllllzzzzzzz
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
Sir u teach very well other teacher take 2hr to teach u explained beautifully in just 12 min
Minblowing 🎉🙏 keep going sir
Thanks for liking
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 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
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Yeah bro..
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
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
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
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 ☺️☺️
with this video all my queries are all solved ..........
Thank you sir . Now I can score good marks in my test.....
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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.
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
Yous explanation is super and I AM impressed 👍👍
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Answer 2nd is A=40 B=88 find C so that 40+88=128/2 = 64 the correct answer
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
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Keep watching
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
Best teacher doesn't exi-😳❤️
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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)
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It's my pleasure
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Thanks
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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
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.
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
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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...
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.
😃
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Most welcome 😊
@@ManochaAcademy s sir
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Your practical version is super cool then other youtubers lecture
Thanks for liking
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.
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🙏
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Thanks a lot! Happy to hear that you like the videos :) I'll definitely upload more videos!
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