We’re being asked to determine the halogen with the lowest 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.
From top to bottom, the halogens are:
Which halogen has the lowest electron affinity?
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