Question
Which of the following pairs of ions have the same electronic configuration?
A.
$$C{u^{2 + }},C{r^{2 + }}$$
B.
$$F{e^{3 + }},M{n^{2 + }}$$
C.
$$C{o^{3 + }},N{i^{3 + }}$$
D.
$$S{c^{3 + }},C{r^{3 + }}$$
Answer :
$$F{e^{3 + }},M{n^{2 + }}$$
Solution :
$$\eqalign{
& F{e^{3 + }}\left( {Z = 26} \right) \to 3{d^5} \cr
& M{n^{2 + }}\left( {Z = 25} \right) \to 3{d^5} \cr} $$