Which electronic configuration of an element has abnormally high difference between second and third ionization energy?

Options

A. `1s^(2) 2s^(2) 2p^(6) 3s^(1)`
B. `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(1)`
C. `1s^(2) 2s^(2) 2p^(6)`
D. `1s^(2) 2s^(2) 2p^(6) 3s^(2)`

Answer

D

Explanation

The element which has two element in the valence shell has highest third ionization energy because in this case , the 3rd electron has to be lost from the inert gas core. In other words option ( d) is correct.