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

Since `e^(-)` is to be removed from exactly half-filled p-orbital.