Question

Which of the given pairs of elements would have a more negative electron gain enthalpy? O or F?

Answer 1

HEY MATE HERE IS YOUR ANSWER:-

F is more negative electron gain enthalpy. because of very small size of F atom.


HOPE IT HELPS.

Answer 2

Oxygen- p block element present in 16th group and 2nd period while fluorine - p block element present in 17th group and 2nd period.

An F atom has one proton and one electron more than O and as an electron is being added to the same shell, the atomic size of F is smaller than  O.

As the F contains one proton more than O, its nucleus can attract incoming electron more strongly in comparison to the nucleus of O atom.

So, F needs only one more electron to attain the stable noble gas configuration.

Therefore, the electron gain enthalpy of F is more negative than that of O.