Which of the following represents an excited state of an atom?

Options

A. `[Ne] 3s^2 3p^6 4s^2 3d^8`
B. `[Ne] 3s^2 3p^6 4s^1 3d^5`
C. `[Ne] 3s^2 3p^6 4s^2 3d^1`
D. `1s^2 2s^2 2p^5 3s^1`

Answer

D