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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
Electronic configuration of Sc 21 is: (1) 1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 6 , 4s 2 , 3d 1 (2) 1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 6 , 4s 1 , 3d 2 (3)1
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