Catalonia PAU Chemistry Practice Questions - Catalonia PAU Chemistry Examination - CIC Generalitat De Catalunya (Química 2n Batxillerat 2026) Exam

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Why is the electron affinity of Chlorine (-349 kJ/mol) more negative (more exothermic) than that of Fluorine (-328 kJ/mol)?

Fluorine has a lower electronegativity than Chlorine. Chlorine has a smaller nuclear charge than Fluorine. Fluorine's compact 2p subshell experiences strong electron-electron repulsion, weakening the net attraction for an incoming electron. Chlorine's 3p subshell can accommodate an extra electron without requiring spin pairing.

Correct Answer:

Fluorine's compact 2p subshell experiences strong electron-electron repulsion, weakening the net attraction for an incoming electron.

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