`1S^(2), 2s^(2) 2p^(6),3s^(2)3d^(10), 4S^(2)4p^(6)` `1s^(2), 2s^(2)2p^(6), 3s^(2)3d^(10), 4s^(1)4p^(1)` `1s^(2),2s^(2)2p^(6),3s^(2)3d^(10), 4s^(2)4p^(2)` `1s^(2), 2s^(2)2p^(6)2d^(10), 3p^(6), 4s^(2)4p^(2)`
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