A first row transition metal with highest enthalpy of atomisation,...

A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula (\mathrm{M}}_{2} \mathrm{O}_{\mathrm{n}}) (where (\mathrm{n}=3,4), 5). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is ______ (\mathrm{BM}$) (near integer) (Given atomic number: (\mathrm{Sc}$: 21, $\mathrm{Ti}$: 22, \mathrm{ V}: 23, $\mathrm{Cr}$: 24, $\mathrm{Mn}$: 25, $\mathrm{Fe}$: 26, $\mathrm{Co}$: 27), (\mathrm{Ni}$: 28, \mathrm{Cu}$: 29, $\mathrm{Zn}$: 30))