Many of the
transition metal ions are paramagnetic Paramagnetism arises from the presence of unpaired electrons, each
such electron having a magnetic moment associated with its spin angular
momentum and orbital angular momentum 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