Of the following elements, __________ has the most negative electron affinity.
We’re being asked to determine the element with the highest (most negative) 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: