Question

why chlorine has more negative electron gain enthalpy than fluorine?​

Answer 1

Hey mate

Fluorine has less negative electron gain enthalpy than chlorine because the size of 2p orbital is very small as compared to 3p orbital of chlorine so when we add electron in 3p orbital of chlorine..so when we add electron in 2p orbital.there will be repulsion of electrons which decreases the electron gain enthalpy of chlorine.

Hope it's helpful for you

^-^

Answer 2

$\bf\large\underline\pink{Answer:-}$

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.