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Which electronic configuration is not al...

Which electronic configuration is not allowed for either 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

none of these

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