"Higher" Electron Affinity

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Lindsey Lill
Posts: 34
Joined: Wed Sep 21, 2016 2:57 pm

"Higher" Electron Affinity

Postby Lindsey Lill » Sat Oct 22, 2016 9:46 pm

Is a "higher" electron affinity technically the more negative one since is energy being released? For example, would -60 be "higher" than -50?

Serena Patel 2H
Posts: 19
Joined: Wed Sep 21, 2016 2:59 pm

Re: "Higher" Electron Affinity

Postby Serena Patel 2H » Sun Oct 23, 2016 1:57 pm

Yes. The negative sign accounts for the fact that energy is being released, so -60 would be higher than -50 because -60 shows the atom has a greater attraction for an electron. A more negative electron affinity means a greater attraction for an electron.

604744616
Posts: 34
Joined: Sun Jun 25, 2017 3:00 am

Re: "Higher" Electron Affinity

Postby 604744616 » Mon Jul 17, 2017 2:12 pm

How would you know which electron has a higher electron affinity than the other?

Cassandra Mullen 1E
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Re: "Higher" Electron Affinity

Postby Cassandra Mullen 1E » Fri Nov 03, 2017 8:58 am

604744616 wrote:How would you know which electron has a higher electron affinity than the other?


You can examine the trends in the periodic table... electron affinity increases across a period and decreases down a group.
Also, an atom with less valence electrons is less likely to gain electrons, so it has a lower electron affinity. An atom with more valence electrons is more likely to gain electrons and has a higher electron affinity.

Kyra LeRoy 1E
Posts: 52
Joined: Sat Jul 22, 2017 3:00 am

Re: "Higher" Electron Affinity

Postby Kyra LeRoy 1E » Tue Nov 07, 2017 6:35 pm

For the most part, electron affinity increases going upwards and to the right. There are a few exceptions (like nitrogen, for example), so the trend is not always exact. If you look at the 3rd photo on this website, it shows the EA's of each element with a corresponding color that makes some of the exceptions more evident.
https://chem.libretexts.org/Textbook_Ma ... rown_et_al.)/07._Periodic_Properties_of_the_Elements/7.5%3A_Electron_Affinities


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