Question

Electron gain enthalpy of Cl is higher than F. Why?

Answer 1

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Chlorine has higher electron gain enthalpy then florine because due to small size of florine some energy is utilized in over coming the force of repulsion among electron.

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Answer 2

This is because in F, the added electron  takes the place in lower energy level n=2 which already has 6 or 7 electrons. This results in more electron-electron repulsion which decreases the stability of negative ion