Chemistry - Complete d-block Question with Solution | TestHub

V²⁺(21)         [ Ar ]¹⁸3d³4s⁰

Cr²⁺(22)       [ Ar ]¹⁸3d⁴4s⁰

Mn²⁺(23)      [ Ar ]¹⁸3d⁵4s⁰

Fe²⁺(24)      [ Ar ]¹⁸3d⁵4s¹

To find ionization enthalpy we first see electronic configuration.
Then we see shell.
If shell are same then see charge.
Then see extra stability ( Half filled and fully filled ).

$\Rightarrow {\text{I.E}}_3\left(\text{Mn}\right)>{\text{I.E}}_3\left(\text{Fe}\right)>{\text{I.E}}_3\left(\text{Cr}\right)>{\text{I.E}}_3\left(\text{V}\right)$