We are asked to rank these elements according to electron affinity.
Ne Br Al
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:
Note: Nobel gases are not included in the trend and will have the lowest electron affinity.
Rank these elements according to electron affinity.
Ne Br Al
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