question_answer

Which of the following has maximum number of unpaired electrons?

A)  \[M{{g}^{2\text{+}}}\]                      

B)  \[T{{i}^{3\text{+}}}\]

C)  \[F{{e}^{2\text{+}}}\]                       

D)  \[C{{u}^{2\text{+}}}\]

Correct Answer: C

Solution :

Electronic configuration of \[Fe{{\,}^{2+}}\] is \[4{{s}^{0}}\,\,\,3{{d}^{6}}\] n = 4 while  \[M{{g}^{2+}}\,\,has\,\,n=0\] \[{{\operatorname{Ti}}^{3+}}\,\,has\,\,n=0\] \[C{{u}^{2+}}\,\,has\,\,n=1\]