A) \[C{{r}^{+3}}\] and \[M{{n}^{+2}}\]
B) \[C{{r}^{+2}}\] and \[F{{e}^{+2}}\]
C) \[{{V}^{+2}}\] and \[S{{c}^{+3}}\]
D) \[T{{i}^{+2}}\] and \[{{V}^{+2}}\]
Correct Answer: B
Solution :
\[C{{r}^{+2}}\] and \[F{{e}^{+2}}\] \[C{{r}^{+2}}\,-\,3{{d}^{4}}\] 4 unpaired electrons \[F{{e}^{+2}}\,-\,3{{d}^{6}}\] 4 unpaired electrons
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