Question

The electron gain enthalpy of F is however unexpectedly less negative than that of Cl. plzzzz explain it in simple practical language!!!!

Answer 1

This is because the atomic size of fluorine is very small. As a result there are strong electronic repulsion due to positively charged protons and negatively charged electrons . Hence the incoming electrons do not feel any attraction. Thus E.A of fluorine is less than that of chlorine and it is not unexpectedly

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.