Thank you for reporting, we will resolve it shortly
Q.
Which of the following order of ionization energy is correct?
JIPMERJIPMER 2004Classification of Elements and Periodicity in Properties
Solution:
Ionisation energy generally increase in a period from left to right. But due to comparatively stabler configuration of Be $\left(1 s^{2},\, 2 s^{2}\right)$, it has more ionisation energy than Boron $\left(1 s^{2},\, 2 s^{2},\, 2 p^{1}\right)$. Hence, the correct order is : $B < Be < C < N$