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The number of unpaired electrons in 1s2 2s2 2p4 is:
(1) 4
(2) 2
(3) 0
(4) 1
Ans: 2
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In a potassium atom, electronic energy levels are in the following order: (1) 4s>3d (2) 4s>4p (3) 4s (4) 4s Ans: 4s
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