Correct set of quantum numbers representing the last electron of iron (Fe) will be
(1) n = 4, l = 0, m = 0, s = +1/2
(2) n = 3, l = 2 m = +2,= +1/2
(3) n = 3, l= 1, m = 0, S = +1/2
(4) n = 3, l= 1. m = -2, s = 0
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