1.

Which of the following options does not represent ground state electronic configuration of an atom?

Answer»

`1s^(2)2s^(2)2p^(6)3s^(2)3P^(6)3d^(8)4S^(2)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(9)4s^(2)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(1)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(1)`

Answer :B


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