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Which of the following configuration is correct for iron:
(1) 1s2, 2s2, 2p6, 3s2, 3p6,, 3d5
(2) 1s2, 2s2, 2p6, 3s2,3p6, 4s2, 3d5
(3) 1s2, 2s2, 2p6, 3s2,3p6, 4s2, 3d7
(4) 1s2, 2s2, 2p6, 3s2,3p6, 4s2, 3d6
Ans: 1s2, 2s2, 2p6, 3s2,3p6, 4s2, 3d6
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