Complex	Electronic configuration of central atom without splitting	Electronic configuration of central atom after octahedral splitting	Crystal field splitting energy	Number of unpaired electrons
${[Fe {(CN)}_{6}]}^{4 -}$	${Fe}^{2 +} = {}_{18}{[Ar]}$ $3 d^{6}$	$t_{2 g}^{6} e_{g}^{0}$	$6 \times (- 0.4 Δ_{0}) + 2 P = - 2.4 Δ_{0} + 2 P$	0
${[Co {({NH}_{3})}_{6}]}^{3 +}$	${Co}^{3 +} = {}_{18}{[Ar]}$ $3 d^{6}$	$t_{2 g}^{6} e_{g}^{0}$	$6 \times (- 0.4 Δ_{0}) + 2 P = - 2.4 Δ_{0} + 2 P$	0
${[{FeF}_{6}]}^{4 -}$	${Fe}^{2 +} = {}_{18}{[Ar]}$ $3 d^{6}$	$t_{2 g}^{4} e_{g}^{2}$	$4 \times (- 0.4 Δ_{0}) + 2 \times (0.6 Δ_{0}) = - 0.4 Δ_{0}$	4
${[Mn {(SCN)}_{6}]}^{4 -}$	${Mn}^{2 +} = {}_{18}{[Ar]}$ $3 d^{5}$	$t_{2 g}^{3} e_{g}^{2}$	$3 \times (- 0.4 Δ_{0}) + 2 \times (0.6 Δ_{0}) = 0$	5

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