Question

Electron gain enthaply of cl is higher than f . why?​

Answer 1

Answer:

Halogens have highest negative value of electron gain enthalpy . here Cl &F both are halogens but electron gain enthalpy of Cl is greater than F because of very small size of F which causes inter electronic repulsion among its electrons.

Answer 2

Answer:

The negative electron gain enthalpy of fluorine is less than that of chlorine. It is due to small size of fluorine atom. As a result, there are strong interelectronic repulsions in the relatively small 2p orbitals of fluorine and thus, the incoming electron does not experience much attraction.