Gadolinium belongs to the 4f series. Its atomic number is 64. Which of the following is the correct electronic configura…

\([\mathrm{Xe}]4{\mathrm{f}}^{6}5{\mathrm{d}}^{2}6{\mathrm{s}}^{2}\)

\([\mathrm{Xe}]4{\mathrm{f}}^{8}6{\mathrm{d}}^{2}\)

\([\mathrm{Xe}]4{\mathrm{f}}^{9}5{\mathrm{s}}^{1}\)

\([\mathrm{Xe}]4{\mathrm{f}}^{7}5{\mathrm{d}}^{1}6{\mathrm{s}}^{2}\)