Among Halogens Correct Order Amount Energy Released Electron Gain Electron Gain Enthalpy

Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is (a) F > Cl … Br…

Answers:

(c) Chlorine has higher electron gain enthalpy than fluorine. This is due to small size of fluorine atom, i.e., the electron density is high which resists the addition of an electron (F < Cl).
In general, electron gain enthalpy decreases as atomic size increases. Thus, electron gain enthalpy follows the order:
Cl > Br > I