Question

In which of the following pairs, the outermost electronic configuration will be the same?

• A. $F{e}^{2+}$ and $C{o}^{+}$
• B. $C{r}^{+}$ and $M{n}^{2+}$
• C. $N{i}^{2+}$ and $C{u}^{+}$
• D. $V^{2+}$ and $C{r}^{+}$

Answer 1

The correct option is B $C{r}^{+}$ and $M{n}^{2+}$

(a) $F{e}^{2+}=\left[Ar\right]3d^{6}C{o}^{+}=\left[Ar\right]3d^7$

(b) $C{r}^{+}=\left[Ar\right]3d^{5}M{n}^{2+}=\left[Ar\right]3d^5$

(c) $N{i}^{2+}=\left[Ar\right]3d^{8}C{u}^{+}=\left[Ar\right]3d^{10}$

(a) $V^{2+}=\left[Ar\right]3d^{3}C{r}^{+}=\left[Ar\right]3d^5$