C.F.S.E. =(−0.4x+0.6y)Δo+zP where x= number of electrons occupying t2g orbital y= number of electrons occupying eg orbital z= number of pairs of electrons For low spin d6 complex electronic configuration =t2g6eg0 or t2g2,2,2eg0∴x=6,y=0,z=3 C.F.S.E. =(−0.4×6+0×0.6)Δo+3P=5−12Δo+3P