Question

which has more negative electron gain enthalpy. justify your answer. F or Cl

Answer 1

Electron gain enthalpy of Flourine is less negative as compared to chlorine because Flourine is stronger oxidizing agent than chlorine.

Answer 2

Answer:

Due to its small size, the electron–electron repulsions in the relatively compact 2p-sub-shell are comparatively large, and hence, the incoming electron is not accepted with the same ease as is the case with larger Cl atom. Consequently, electron gain enthalpy of Cl is more negative than that of F.