Electron Affinity

Electron affinity, in general, becomes more negative as we move left to right across the periodic table (makes sense since $Z_{eff}$ is increasing!). Several exceptions occur in this trend as well due to especially stable electron configurations having filled subshells or shells. The group 2 and group 8 elements have positive electron affinities since adding electrons to a new subshell (group 2) or shell (group 8) will be unfavorable. There is no clear trend down a group.

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