A) $ M{g^{2+}} $
B) $ T{i^{3+}} $
C) $ {V^{3+}} $
D) $ F{e^{2+}} $
Correct Answer: D
$ F{e^{2+}} $ has $ 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{6} $ configuration with 4 unpaired electron.
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