For the compounds of the
first series of transition metals, the contribution of the orbital angular
momentum is effectively quenched and hence is of no significance For
these, the magnetic moment is determined by the number of unpaired
electrons and is calculated by using the ‘spin-only’ formula, i e ,


n n
2
 

where n is the number of unpaired electrons and µ is the magnetic
moment in units of Bohr magneton (BM)