Chemistry / Chem 0892 · Atom · ~20 seconds
Electron Affinity Trend
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Electron affinity is the energy change when a gaseous atom gains an electron, growing more negative across a period as Zeff increases.
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A halogen's high Zeff attracts an added electron strongly, releasing energy and giving a strongly negative affinity.
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A more negative electron affinity means a stronger pull on the electron, not a measure of reluctance to accept one.