Question

Which of the following has lowest electron affinity?

• A. $Cl$
• B. $I$
• C. $F$
• D. $Br$

Answer 1

Answer: (B)

In a group the electron affinity decreases on moving downward because the size increases.

Halogen	$F$	$Cl$	$Br$	$I$
EA (eV)	$-3.6$	$-3.8$	$-3.5$	$-3.2$

The low value of electron affinity of fluorine than chlorine is due to its small size.