Question

Which one is having higher value of second ionisation energy ($I{E}_2$) among $N$ and $O$?

• A. $O$
• B. $N$
• C. Both have same
• D. None of these

Answer 1

The correct option is A $O$

Electronic configuration:
$N-\left[He\right]2s^{2}2p^3$
$O-\left[He\right]2s^{2}2p^4$
$N^{+}-\left[He\right]2s^{2}2p^2$
$O^{+}-\left[He\right]2s^{2}2p^3$
$O^{+}$ has half filled stable configuration so it will be more harder for $O^{+}$ to lose an electron than $N^{+}$. Hence $I{E}_2$ of $O$ will be higher than $N.$