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)

$O > C > B > N$

Answer 2

$\underset{140.9}{O} > \underset{122.3}{C} > \underset{83}{B} > \underset{0}{N}$ Value of electron affinity increases on going from left to right in periods but the value of electron affinity of V^th A elements is less than that of IV^th A element, this is due to half filled p-orbitals presence.