Electron Affinity Trends

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Sandeep Gurram 2E
Posts: 42
Joined: Fri Sep 25, 2015 3:00 am

Electron Affinity Trends

Postby Sandeep Gurram 2E » Sat Oct 10, 2015 12:34 am

For both ionization energies and size there are general trends that have relatively few exceptions within their trends. However, electron affinities seem to be all over the place. Although it is true that the upper right elements generally have high electron affinities, there is not the same constancy in electron affinity trends as there are in ionization energy or size trends. Anyone have an explanation for why?

Du-A Lee 3C
Posts: 10
Joined: Fri Sep 25, 2015 3:00 am

Re: Electron Affinity Trends

Postby Du-A Lee 3C » Sat Oct 10, 2015 4:08 pm

Upper right elements generally have higher electron affinities because electrons are added to each energy level as they become closer to the nucleus and have stronger attraction. Hence, those same elements have lower atomic radii because the strong attraction pulled in electrons closer to the nucleus.

Vice versa, upper right= higher electron affinities and smallest size
lower left= lower electron affinities and largest size

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