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Electron Gain Enthalpy Trend (Electron gain enthalpy becomes more negative (more exothermic) toward top-right nonmetals)

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Electron gain enthalpy becomes more negative (more exothermic) toward top-right nonmetals; many texts discuss magnitude; know sign conventions in the question

What each symbol means

SymbolWhat it stands for
\Delta_{\mathrm{eg}} HEnthalpy change when 1 mol gaseous atoms gain 1 mol electrons

When to use this

NCERT-style: more negative Δ_egH means greater tendency to accept electron. Noble gases: positive (unfavorable). Cl often more negative than F due to small F size / e⁻–e⁻ repulsion (anomaly).