Solution: Choose the element with the more negative (more exothermic) electron affinity from each of the following pairs.C or N

Problem

Choose the element with the more negative (more exothermic) electron affinity from each of the following pairs.

C or N

Solution

We’re being asked to determine the element with the most negative electron affinity (i.e. high 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. 


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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