Question

Which has less negative electron gain enthalpy o or f?

Answer 1

Answer:

Dear user,

...Hence, the electron gain enthalpy of F is more negative than that of O. ... The electron gain enthalpy usually becomes less negative on moving down a group. However, in this case, the value of the electron gain enthalpy of Cl is more negative than that of F because of very small size of F atom.

Answer 2

Answer:

As F contains one proton more than O, its nucleus can attract the incoming electron more strongly in comparison to the nucleus of O atom. Also, F needs only one more electron to attain the stable noble gas configuration. Hence, the electron gain enthalpy of F is more negative than that of O.