Periodic Trend: Electron Affinity Video Lessons

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Problem: Which element would most likely have a positive electron affinity?A. NaB. AlC. RbD. Ar

FREE Expert Solution

Recall that electron affinity is the energy change from the addition of 1 e to a gaseous element/ion

It is represented by this chemical equation:

Atom(g) + e  Ion(g), ΔE = –E.A. 

The trend for electron affinity is as follows: it increases from left to right and decreases down a period in the periodic table. The given elements are:

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Problem Details

Which element would most likely have a positive electron affinity?

A. Na
B. Al
C. Rb
D. Ar

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