Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy?

Options

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

Answer

D

Explanation

Highest ionisation energy will be of `Ne[3s^(1)3p^(1)]`, it has half-filled 3p orbitals which are most stable than partially filled orbitals.
`:.` It will be very difficult to extract electron from a stable system.