Which of the following electronic config...

Which of the following electronic configuration is not possible in the ground state of an atom?

A

`1s^2 2s^2`

B

`1s^2 2s^2 2p^6`

C

`1s^2 2s^2 2p^5`

D

`1s^2 2s^2 2p^2 3s^1`

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