Problem: For which element is the gaining of an electron most exothermic?a) Lib) Nc) Fd) B

FREE Expert Solution

Exothermic reactions: lose energy and involve bonds breaking; ΔH is negative

Endothermic reactions: gain energy and involve bonds forming; ΔH is positive

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.

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Problem Details

For which element is the gaining of an electron most exothermic?
a) Li
b) N
c) F
d) B

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