Chemistry Question on Classification of elements & periodicity in properties

Question

Electron affinity is maximum for

Answer 1

Solution

Generally, electron affinity decreases down the group but increases in a period. However, the electronegativity of $Cl$ is more than $F$ because of the smaller size of $F$ , due to which their is a greater repulsion between the incoming electron and electrons present in its valence shell. Hence, $Cl$ has the maximum electron affinity among halogens.