Question

Hello gents the correct order of amount of energy released in electron gain enthalpy is

Answer 1

The electron gain enthalpy of halogens decreases as we move down the group because -

- As we move down the group the atomic size of increases.

- This leads to less force of attraction between the nucleus and the outermost electrons.

-However, the electron gain enthalpy of Cl is more than F because in Flourine atom there are interatomic repulsions due to its small size which leads to an increase in electron gain enthalpy.