S.no	Complex	Electronic configuration of central metal ion before splitting	Electronic configuration of central metal ion after splitting	CFSE
I	${[Mn {(CN)}_{6}]}^{3 -}$	${Mn}^{3 +} = {}_{18}{[Ar]}$ $3 d^{4}$	$t_{2 g}^{2, 1, 1} e_{g}^{0, 0}$	$4 \times (- 0.4 Δ_{o}) + P = - 16 Δ_{o} + P$
II	${[Co {(CN)}_{6}]}^{4 -}$	${Co}^{2 +} = {}_{18}{[Ar]}$ $3 d^{7}$	$t_{2 g}^{2, 2, 2} e_{g}^{1, 0}$	$6 \times (- 0.4 Δ_{o}) + 1 \times (0.6 Δ_{o}) + P = - 1.8 Δ_{o} + P$
III	${[Fe {(CN)}_{6}]}^{4 -}$	${Fe}^{2 +} = {}_{18}{[Ar]}$ $3 d^{6}$	$t_{2 g}^{2, 2, 2} e_{g}^{0, 0}$	$6 \times (- 0.4 Δ_{o}) + 2 P = - 2.4 Δ_{o} + P$
IV	${[Fe {(CN)}_{6}]}^{3 -}$	${Fe}^{3 +} = {}_{18}{[Ar]}$ $3 d^{5}$	$t_{2 g}^{2, 2, 1} e_{g}^{0, 0}$	$5 \times (- 0.4 Δ_{o}) + 2 P = - 2.0 Δ_{o} + P$

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