Chemistry Structure of Atom

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

1

1s² 2s² 2p⁶3s² 3p⁶ 3d⁸ 4s²

2

1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹ 4s²

3

1s2 2s2 2p6 3s2 3p⁶ 3d10 4s1

4

1s2 2s2 2p6 3s2 3p6 3d5 4s1

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