Question

Which of the following configurations will have the least electron affinity?

• A. $n{s}^{2}n{p}^5$
• B. $n{s}^{2}n{p}^2$
• C. $n{s}^{2}n{p}^3$
• D. $n{s}^{2}n{p}^4$

Answer 1

The correct option is C

$n{s}^{2}n{p}^3$

Elements with either half-filled or completely filled sub shells have a stable electronic configuration. The elements with stable configurations have less electron affinity or electron gain enthalpy.

$n{s}^{2}n{p}^3$ $⟶$ 15th group (V A group) has half filled p-subshell.