The absolute value of the electron gain enthalpy of halogens satisfies:

🧠 Cl wins over F because F's shell is too cramped — adding a new electron there causes too much repulsion Halogens are the champs of electron gain. The expected order would be F Cl Br I (smaller atom = stronger pull). But F breaks this rule. Its subshell is so compact that the incoming electron faces unusually high inter-electronic repulsion. Cl has a roomier — the new electron fits comfortably. So Cl is the most exothermic, F slightly less. 🗺️ Order by magnitude (kJ/mol) — biggest mag

PERI-075: The absolute value of the electron gain enthalpy of hal... | JEE Main 2021 · Mar · S-I

PERI-075L1Classification of Elements and Periodicity JEE Main 2021 · Mar · S-I

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