Which of the following do not represent ground state electronic config

1.	Which of the following do 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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