Question

The electron affinity values $\left(inkJmo{l}^{-1}\right)$ of three halogens x, y and z are respectively -349, -333 and -325. Then x, y and z are respectively

• A. $F_2,C{l}_{2}andB{r}_2$
• B. $C{l}_2,F_{2}andB{r}_2$
• C. $C{l}_2,B{r}_{2}and{F}_2$
• D. $B{r}_2,C{l}_{2}and{F}_2$

Answer 1

The correct option is B $C{l}_2,F_{2}andB{r}_2$

Generally electron affinity decreases down the group but $F_2$ has a lower electron affinity compared to $C{l}_2$ because the size of $F_2$ is very small and hence interelectronic repulsion is high.