Question

If $\Delta _{0} < P,$ the correct electronic configuration for $d^{4}$ system will be -

• A. $t_{2 g}^{4} e_{g}^{0}$
• B. $t_{2 g}^{3} e_{g}^{1}$
• C. $t_{2 g}^{0}t_{g}^{4}$
• D. $t_{2 g}^{2}e_{g}^{2}$

Answer 1

Answer: (B)

Splitting energy is less then pairing energy, hence it is a weak field ligand splitting. Thus $t_{2 g}$ orbitals are half filled then electron goes to $e_{g}$ orbital before pairing.