More be the number of unpaired electrons → more be the magnetic moment. and Number of unpaired electrons in Mg2+=0 Number of unpaired electrons in Ti3+=1 Number of unpaired electrons in V3+=2 Number of unpaired electrons in Fe2+=4 Thus, Fe2+ show maximum value of magnetic moment (µ). also, µ=√n(n+2).BM(n= Number of unpaired electrons).