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Among the following representations of e...

Among the following representations of excited states of atoms which is impossible ?

A

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

B

`[Ne]3s^(2)3p^(3)4s^(1)`

C

`[Ne]3s^(2)3p^(6)4s^(1)3d^(6)`

D

`1s^(2)2s^(2)2p^(7)3s^(2)`

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