Using CFSE = (-0.4 n_t_2g + 0.6 n_e_g)Delta_o and ignoring pairing energy, the CFSE of an octahedral d^3 ion is

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Using CFSE $= (- 0.4 n_{t_{2 g}} + 0.6 n_{e_{g}}) Δ_{o}$ and ignoring pairing energy, the CFSE of an octahedral $d^{3}$ ion is

d^{3}

t_{2 g}^{3} e_{g}^{0}

. CFSE

= - 0.4 \times 3 + 0.6 \times 0 = - 1.2 Δ_{o}