question_answer

Which one of the following ions has the same number of unpaired electrons as that of \[{{\text{V}}^{\text{3+}}}\] ion?

A)  \[C{{r}^{3+}}\]                 

B)  \[M{{n}^{2+}}\]

C)  \[N{{i}^{2+}}\]                 

D)  \[F{{e}^{3+}}\]

Correct Answer: C

Solution :

                 Atomic no. of vanadium = 23 Its configuration is \[{{\,}_{23}}V=[Ar]3{{d}^{3}},4{{s}^{2}}\] \[{{V}^{3+}}=[Ar]3{{d}^{2}}\] \[\text{N}{{\text{i}}^{\text{2+}}}\]also has 2 unpaired electrons.