Among the following representations of excited states of atoms which is impossible ?

Options

A. `1s^2 2s^1`
B. `3s^2 3p^3 4s^1`
C. `1s^2 2s^2 2p^4 3s^2`
D. `[Ne]3s^2 3p^6 3d^2 4s^3`

Answer

D

Explanation

`4s^3` is not possible