Question
Among the following series of transition metal ions, the one in which all metal ions have $$3{d^2}$$ electronic configuration is
$$\left( {{\text{At}}{\text{. no}}{\text{.}}\,Ti = 22,V = 23,} \right.$$ $$\left. {Cr = 24,Mn = 25} \right)$$
A.
$$T{i^{3 + }},{V^{2 + }},C{r^{3 + }},M{n^{4 + }}$$
B.
$$T{i^ + },{V^{4 + }},C{r^{6 + }},M{n^{7 + }}$$
C.
$$T{i^{4 + }},{V^{3 + }},C{r^{2 + }},M{n^{3 + }}$$
D.
$$T{i^{2 + }},{V^{3 + }},C{r^{4 + }},M{n^{5 + }}$$
Answer :
$$T{i^{2 + }},{V^{3 + }},C{r^{4 + }},M{n^{5 + }}$$
Solution :
$$\eqalign{
& T{i^{2 + }} = 1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^2},4{s^0} \cr
& {V^{3 + }} = 1{s^2},2{s^2}2{p^6},3{s^2}3{p^6},3{d^2},4{s^0} \cr
& C{r^{4 + }} = 1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^2},4{s^0} \cr
& M{n^{5 + }} = 1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^2},4{s^0} \cr} $$