A) $ Z{n^{+}} $
B) $ F{e^{2+}} $
C) $ {N^{3+}} $
D) $ C{u^{+}} $
Correct Answer: B
$ F{e^{2+}},[Ar],3d^{6}4s^{0} $
$ F{e^{2+}} $ consist of maximum 4 unpaired electrons.
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