Electron affinity: period trend | Atomic structure and properties | AP Chemistry | Khan Academy
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- Опубліковано 6 бер 2017
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Electron affinity is the energy change that results from adding an electron to a gaseous atom. For example, when a fluorine atom in the gaseous state gains an electron to form F⁻(g), the associated energy change is -328 kJ/mol. Because this value is negative (energy is released), we say that the electron affinity of fluorine is favorable. View more lessons or practice this subject at www.khanacademy.org/science/a...
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My mind is fried bc my chem teacher sucks at teaching and apparently I've learned nothing from her classes the past two years.
Josh Porter oh yeah yeah
was she 🔥🔥🔥
@@Chroamina 2years is quite long tho!!
Easy money for her
God i have the same problem I am in clg 2nd year and I still don't have my basics cleared. So, about 4 years now
my teacher was an stealer she won't clarify our doubts but takes fees so i learn chemistry in youtube i did not understand electron affinity this video clarified all doubts of mine you deserve a bright future
So good, didn't take AP chem but this makes a lot of sense!
Awesome. Great Visual Explanation!
It cleared my idea about E.affinity... Thanks brother.
Divided by nations , United by learning !
"So, I'll start with a lithium atom. And in a neutral lithium atom there are 3 protons so there is our +3 charge and the electronic configuration of a neutral lithium atom is 1s2 2s1."
I heard this line in starting of every video made by this guy..
He loves LITHIUM accurately A NEUTRAL LITHIUM ATOM!!
Super vid, thanks a lot :)Keep 'em commin' !
So helpful video.... Thanks khan academy
Thank you so much sir. You made so many points clear :D
Khan academy has been ready for Covid19 since 2017
That was so good!!! thank youuu
this literally helped so much. thank you khan academy. gonna go and ACE my test bye 🏃♂️🏃♂️🏃♂️
love it,i was't able to understand after attending 2 classes and watching a online video twice but ,khan academy made it clear
Rishabh mohan?
@@sushmathakur2222 Sushma Thakur?
@@sushmathakur2222 sushma thakur????
Infinite thanks...!!!!
WHERE IS SALMAN KHAN!?!?
Yet I don't understand why energy is released when an electron is added!
mariam bassam because a free electron is more energetic as compared to valence shell electrons. So in order to become a part of the valence shell, the electron must lose energy to become a part of that shell.
Anoosha Iftikhar thank you so much 😍
+Anoosha Thank you so much really❤
@@anoosha9768 thank you 😍
Anoosha wow I love you
Patton Oswald is a great chem teacher
Thank you...
It's very fine en clear
Thank you:)
👍👍 i understand
I'm sorry, I'm just wondering, wasn't Zeff supposed to be # of protons - # of core electrons? In other words, should've it been 10 - 2 (because of electrical configuation, 2, 8, 18, 32)? Also, how did you find the "shileding" electron?
See here's how it is ...
You have a neon atom with 10 electron you try to add one electron well protons will attract the electron towards it but all the other elctrons tend to repel it as they have like charges so. Here core elctrons means all the elctrons of an atom not only of first orbit. But all the orbits..
Liked...😎
Does lithium (EA = -60) every really form an anion? I am accustomed to the idea of a lithium cation, but not anion.
Where did the kjs come?
what program do you use to draw on the board
Graphic Tablet is used to draw :)
U can find application www.educatorstechnology.com/2015/02/best-whiteboard-apps-for-teachers.html
i have one doubt .....so when we add an electron to lithium which has the configuration 1s^2 2s^1 its configuration changes to Li^-1 so Li^-1 configuration looks like beryllium ...so ...when
I find an atom in nature while im in a kind of a research(just a thought) ...with the configuration of 1s^2 2s^2........ is it beryllium or Li^-1 ????????? pls help !!!!!!!!!
These elements can not be found simply as li and beryllium in nature ,it must be in form of oxides or sulphides or other forms so it may vary according to the state of combination it is present
@@sarveshwarianbarasu thank you mam !!!! doubt cleared
I thought energy was released when you lose an electron so now energy is released again when you gain an electron? If the energy is given off then the atom would lose that energy and be neutral again right? so are electrons just energy and not matter?
If nitrogen doesn't have an affinity for an electron then why doesn't a carbon atom also have its electron affinity as zero. Doesn't carbon also have 4 half filled orbitals?
Mukul Singal the electron in the 2s orbital doesn’t go up to the p orbital
why boron has less electron affinity than lithium
Li has larger atomic size as compared to boron and B has greater nuclear charge effect.
but energy will be required for adding an electrons to an atom in electron affinity
Ashutosh A ... electron affinity means the amount of Energy released to add a electron in neutral gaseous atom ......in ionization potential energy will be required to remove an electron from a neutral isolated gaseous atom
Yes
But what's the need of electron affinity , when we can do well with electron gain enthalpy as it is according to thermodynamic convention.......
Soooo confusing o_o
What's the definition of electron affinity?
Sally Chan The amount of energy released when a neutral gaseous atom aquires one electron
I am more confused now... so Li requires energy to become 1+? I thought the reaction of Li is exothermic not endothermic
Well from my understanding, as there is a high amount of attraction between the outer most electron and the nucleus (due to small atomic radius and little electron shielding), a lot of energy would be required to rip that electron away. Or another way of looking at it would be to say that a lot of energy would be needed to break the electrostatic bond between the two. This is for the ionisation of Lithium.
Where’s the other khan academy guy?
Why do electrons give energy in the first place when added to an atom?
Whatever queries you have you can go and comment on PROFESSOR DAVE EXPLAINS video and he will answer you within a couple of hours. But he will.......I got many of mine cleared from him :)
Cause a free electron has a more energy or it is at higher state than all the other elctrons of atom so for the electron to be added some eenrgy has to be given out so that it is stable
You made a mistake on Z effective of Ne of the electron 3s1 it's not 0 it's 1.3 !!!!!! (Slater rules)
You should show us how to arrange in order (increasing or decreasing).....
Not so good
Thé lithium affinity is positive
no its not
Told wrong li- lithium anoin is smaller than li ok dude
@Mohammad Nematzadehgharakheil if it's an anion then it's (-) and therefore the lithium anion is not smaller but larger than the lithium atom.
Not understand
Did anyone realize that nobody disliked this video
lol someone always has to hate for no reason
Lin Huichi, you are absolute right.
Arrian Morshed , 2 dislikes by 2 lunatics
Gorros dinosaurios
xue 717
tell us who is more talented than him
then only we can believe
plz talk bangla
Now people disliked this video
Not a good explanation