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Which one is the electronic configuration of Fe+2:
(1) 1s2, 2s2, 2p6, 3s2, 3p6, 3d6
(2) 1s2, 2s2, 2p6, 3s2, 3p4, 4s2
(3) 1s2, 2s2, 2p6, 3s2, 3p6, 3d5, 4s1
(4) None of these
Ans: 1s2, 2s2, 2p6, 3s2, 3p6, 3d6
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