Question -Which of the following configurations will have the least electron affinity?
Options:
A .  ns2 np5
B .  ns2 np2
C .  ns2 np3
D .  ns2 np4
Answer: Option C : C Elements with either half-filled or completely filled sub shells have astable electronic configuration. The elements with stable configurations have less electron affinity or electron gain enthalpy. ns2np3⟶ 15th group (V A group) has half filled p-subshell.
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