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1s^2 2s^2 2p^6: Ne:: Ar....

`1s^2 2s^2 2p^6`: Ne::_________ Ar.

A

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

B

`1s^2 2s^2 2p^6 3s^2 3p^6 4s^2`

C

`1s^2 2s^2 2p^63s^2 3p^6 4s^2 3d^10`

D

18

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