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Which electronic configuration is not al...

Which electronic configuration is not allowed for a neutral atom or an ion in ground state ?

A

`1s^(2) 2s^(2) 2p^(6) 3s^(1)`

B

`1s^(2) 2s^(2) 2p^(6) 3d^(5)`

C

`1s^(2) 2s^(2) 2p^(6) `

D

`1s^(2) 2s^(2) 2p^(6) 3s^(2)`

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