Electron affinity trends

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Camryn Marshall 1C
Posts: 37
Joined: Fri Sep 25, 2015 3:00 am

Electron affinity trends

Postby Camryn Marshall 1C » Sat Oct 10, 2015 2:02 pm

Is there a trend that shows increasing and decreasing electron affinity on the periodic table? If not how would we be able to calculate the electron affinity?

HoganFenster2E
Posts: 23
Joined: Fri Sep 25, 2015 3:00 am

Re: Electron affinity trends

Postby HoganFenster2E » Sat Oct 10, 2015 2:17 pm

It is not as periodic as atomic radius or ionization energy, but generally electron affinity is higher for the elements in the top right of the periodic table. However there are a few exceptions like how Carbon's electron affinity is higher than nitrogen's.

Egbert Lin 3B
Posts: 2
Joined: Fri Sep 25, 2015 3:00 am

Re: Electron affinity trends

Postby Egbert Lin 3B » Sun Oct 18, 2015 10:57 pm

Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus a stronger attraction between the nucleus and its electrons.
Electron affinity decreases down the groups and from right to left across the periods on the periodic table because the electrons are placed in a higher energy level far from the nucleus, thus a decrease from its pull.


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