Problem: What are the observed periodic trends in electron affinity?

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We are asked to show the observed trends in electron affinity.

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. 



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What are the observed periodic trends in electron affinity?

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