Question

Which of the following configurations represent atoms of the elements having the highest second ionization energy?

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

If you want to have a high second I.E, then the resulting ion after removing the first electron has to be stable.

$1s^{2}2s^{2}2p^{3}3s^1$

Only in the above case, we see this happening.