The general electronic configuration of  d-block elements is

${\text{ns}}^{\text{1}–\text{2}}\left(\text{n}–\text{1}\right){\text{d}}^{\text{1 }–\text{1}0}$

${\text{ns}}^{\text{2}}\left(\text{n}–\text{1}\right){\text{d}}^{\text{1}}\left(\text{n}–\text{2}\right){\text{f}}^{\text{1}–\text{14}}$

${\text{ns}}^{\text{1}–\text{2}}\left(\text{n}–\text{1}\right){\text{d}}^{\text{1}–\text{9}}$

${\text{ns}}^{\text{1}–\text{2}}{\text{np}}^{\text{6}}\left(\text{n}–\text{1}\right){\text{d}}^{\text{1}–\text{1}0}$