[MP PET 1999; RPET/PMT 1999]
A) $ C{{u}^{+}} $
B) $ C{{o}^{2+}} $
C) $ N{{i}^{2+}} $
D) $ F{{e}^{3+}} $
Correct Answer: A
$ C{{u}^{+}}-3d^{10}4s^{0} $ ; no unpaired $ {{e}^{-}} $ .
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