[BHU 1997]
A) $ C{{u}^{+}} $
B) $ C{{u}^{2+}} $
C) $ T{{i}^{4+}} $
D) $ {{V}^{5+}} $
Correct Answer: B
$ C{{u}^{2+}},\to ,3d^{9}4s^{0} $ 1 unpaired $ {{e}^{-}} $ .
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