Which one of the following ions is the most stable in aqueous solution? (At No. Ti =22, ~V =23, Cr =24, Mn = 25)

Step-by-step solution

In aqueous solution the configuration of the ions are following aligned Cr ³⁺(21) & =3 d^3 4 s^0 t_ 2 g ^3 e_g^0 ~V ³⁺(20) & =3 d^2 4 s^0 t₂₈ ^2 e_g^0 Tr ³⁺(19) & =3 d^1 4 s^0 t₂₈ ^1 e_g^0 Mn ³⁺(22) & =3 d^4 4 s^0 t_ 2 g ^4 e_g^0 aligned We know that half-filled and fully filled orbitals are more stable than partially filled orbitals. Hence among the given ions the only Cr ³⁺ ion which occupies half-filled t_ 2 g orbitals. Caution Although Mn ³⁺ ion has half-filled t_ s orbital but there is one more electron filled