Gadolinium (Gd) has $4{\mathrm{f}}^{7}5{\mathrm{d}}^{1}6{\mathrm{s}}^2$ electronic configuration outside the [Xe] core. Find spin magnetic moment of ${\mathrm{Gd}}^{3+}$.

• A

  $\sqrt{63}\mathrm{B}.\mathrm{M}$

• B

  $\sqrt{35}\mathrm{B}.\mathrm{M}$

• C

  $\sqrt{48}\mathrm{B}.\mathrm{M}$

• D

  $\sqrt{24}\mathrm{B}.\mathrm{M}$