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Which of the following electronic configuration is not possible:
(1) 1s2 2s2
(2) 1s2 2s2 2p6
(3) [Ar]3d10 4s2 4p2
(4) 1s2 2s2 2p2 3s1
Ans: 1s2 2s2 2p2 3s1
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Which of the following has the least energy: (1) 2p (2) 3p (3) 2s (4) 4d Ans: 2s
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