The number of unpaired electrons in ${\mathrm{Gd}}^{3+}$ is.....

The number of unpaired electrons in ${\mathrm{Gd}}^{3+}$ is 7.It has atomic number 64.

The electronic configuration of ${\mathrm{Gd}}^{+2}$ is,.$\left[\mathrm{Xe}\right]4{\mathrm{f}}^7$

 So number of unpaired electrons =7