Question

Which of the following configuration will have least electron affinity -

• A. ns2np5
• B. ns2np2
• C. ns2np3
• D. ns2np4

Answer 1

The correct option is C

ns2np3

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

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