Question

The number of unpaired electrons in $C{r}^{3+}$ ion is:

• A. 3
• B. 5
• C. 4
• D. 1

Answer 1

Answer: (A)

3

The electronic configuration of $Cr=\left[Ar\right]3d^{5}4s^1$

$C{r}^{3+}=\left[Ar\right]3d^3$

Hence, there are 3 unpaired electrons in $C{r}^{3+}$.