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Electronegativity vs. Electron affinity

Posted: Sun May 13, 2018 9:36 pm
by Alicia Beebe
Hi!
Two questions
1. Can someone summarize the difference between electronegativity and electron affinity?
2. What was the rule comparing electronegativity and placement within a lewis structure? Was is that in general the highest electronegativity goes in the middle, or the lowest? Or what was the rule from lecture?
Thank you!

Re: Electronegativity vs. Electron affinity

Posted: Sun May 13, 2018 9:40 pm
by Chem_Mod
Electronegativity is a scale that was created to determine how much an atom wants an electron while an electron affinity is the energy released when a neutral atom gains an electron.
Could you clarify what you mean by question 2?

Re: Electronegativity vs. Electron affinity

Posted: Sun May 13, 2018 10:26 pm
by Jasmine Emtage-1J
To answer your second question, I believe the less electronegative an element is, the more likely it is to be the central atom.

Re: Electronegativity vs. Electron affinity

Posted: Sun May 13, 2018 10:41 pm
by Bianca Nguyen 1B
I think an exception for this though would be hydrogen, as it is never a central atom since it can only share 1 electron

Re: Electronegativity vs. Electron affinity

Posted: Sun May 20, 2018 10:22 pm
by Alicia Beebe
To clarify, this means that electronegativity and electron affinity are expressing the same idea, or a similar idea, but electronegativity is a relative scale whereas electron affinity is quantitative?

Re: Electronegativity vs. Electron affinity

Posted: Sun May 20, 2018 10:31 pm
by Isobel Tweedt 1E
This also means that electronegativity and electron affinity follow the same periodic trends - increasing as you move up and to the right. This also means the atomic size is decreasing.

Re: Electronegativity vs. Electron affinity

Posted: Sun May 20, 2018 11:23 pm
by Heung Ching Chia 1E
To answer your second question, the central atom is usually the atom with the lowest electronegativity as the central atom is the one that shares more electrons than the non-central atoms. The higher the electronegativity, the less the atom wants to share electrons with another atom. Therefore, the more electronegative atom would be more likely to hold on to its electrons and would rather have a lone pair. Thus, the least electronegative atom is usually the central atom.

Re: Electronegativity vs. Electron affinity

Posted: Mon May 21, 2018 11:19 pm
by John Miller-1I
Alicia Beebe wrote:To clarify, this means that electronegativity and electron affinity are expressing the same idea, or a similar idea, but electronegativity is a relative scale whereas electron affinity is quantitative?


I believe this is correct, in a practical sense they can be thought of as the same way as they both describe which element "pulls" electrons harder, even though in a technical sense they are different