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Does electron affinity increase across the period, and decrease down the group?
Electron affinity generally increases across periods in the periodic table and decreases down groups. This trend is attributed to the increasing nuclear charge across periods, which enhances the attraction of added electrons. In contrast, the addition of electron shells down groups reduces the effective nuclear charge experienced by the outermost electrons, leading to lower electron affinity values. Understanding these trends is crucial for predicting the reactivity of elements.
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