A) \[C{{u}^{+}}\]
B) \[C{{o}^{2+}}\]
C) \[N{{i}^{2+}}\]
D) \[F{{e}^{3+}}\]
Correct Answer: A
Solution :
\[C{{u}^{+}}-3{{d}^{10}}4{{s}^{0}}\]; no unpaired \[{{e}^{-}}\].
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