[BIT 1992; CBSE PMT 1999]
A) $ Zn $
B) $ F{{e}^{2+}} $
C) $ N{{i}^{3+}} $
D) $ C{{u}^{+}} $
Correct Answer: B
$ F{{e}^{+2}}-3d^{6}4s^{0}-4 $ unpaired $ {{e}^{-}} $ .
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