correct configuration of fe3 26 is1 1s2 2s2
Correct configuration of Fe+3 [26] is:
(1) 1s2, 2s2, 2p6, 3s2, 3p6, 3d5
(2) 1s2, 2s2, sp6, 3s2, 3p6, 3d3, 4s2
(3) 1s2, 2s2, 2p6, 3s2, 3p6, 3d6, 4s2,
(4) 1s2, 2s2, 2p6, 3s2, 3p6, 4s1
Ans: 1s2, 2s2, 2p6, 3s2, 3p6, 3d5
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