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which must represent an atom in an excit...

which must represent an atom in an excited state?

A

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

B

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

C

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

D

`1s^(2)2s^(2)2p^(5)`

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c
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