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

Problem

What are the observed periodic trends in electron affinity?

Solution

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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