Electron affinity is the energy change from the addition of 1 e– to 1 mol of gaseous atoms or ions. This is the opposite of ionization energy.
Atom(g) + e– → ion–(g) ΔE = –EA
This is a exothermic reaction as seen by the negative change in energy. Generally, electron affinity:
Choose the element with the more negative (more exothermic) electron affinity from each of the following pairs.
Li or F
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