Question

The correct order of electron affinity of $B,C,N,O$ is

• A. $O>C>N>B$
• B. $B>N>C>O$
• C. $O>C>B>N$
• D. $O>B>C>N$

Answer 1

Answer: (C)

The correct order of electron affinity of $B,C,N,O$ is $O>C>B>N$.
On moving left to right in a period, the electron affinity becomes more negative.
$N$ has positive electron affinity due to extra stability of exactly half-filled $p$ orbitals.