Which one of the following elements has the highest ionisation energy?

Options

A. `[Ne]3s^2 3p^1`
B. `[Ne] 3s^2 3p^2`
C. `[Ne]3s^2 3p^3`
D. `[Ar]3d^10 4s^2 4p^2`

Answer

C

Explanation

`[Ne]3s^2 3p^3` have all orbital filled and p - orbital half filled hence its not easy to remove the `e^(-)` therefore higher the `I.E.`