Question

The electron affinity of halogens are $F-322,Cl-347,Br-324,I=295kJ{mol}^{-1}$. The higher value of $Cl$ as compared to that of $F$ is due to:

• A. weaker electron-electron repulsion in $Cl$
• B. higher atomic radius of $F$
• C. smaller electronegativity of $F$
• D. more vacant p-subshell in $Cl$

Answer 1

The correct option is A weaker electron-electron repulsion in $Cl$

Electron affinity value of $Cl$ is higher than of $F$ as $Cl$ belongs to the 3rd period while $F$ belongs to 2nd period. In $Cl$, electron-electron repulsion forces are weaker than that of $F$.