Which of the following electronic configurations represents a sudden large gap between the values of second and third ionization energies of an element?

Options

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

Answer

D