Q. The correct order of ionisation energy of C, N, O, F is
A) $F < O < N < C$
B) $F < N < C < O$
C) $C < N < O < F$
D) $C < O < N < F$
Explanation
(d)
Ionisation energy generally increases from left to right in a period but ionisation energy of nitrogen is greater than oxygen due to stable $p^{3}$configuration. Hence, the order is as
$C < O < N < F$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.