The 'spin only' magnetic moment value of MO_4^2- is ____ BM. (Where M is a metal having least metallic radii. among Sc, Ti, V, Cr, Mn and Zn ).…

The 'spin only' magnetic moment value of $\displaystyle \mathrm{MO}_4{ }^{2-}$ is $\displaystyle \_\_\_\_$ BM. (Where M is a metal having least metallic radii. among $\displaystyle \mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}$ and Zn ). (Given atomic number: $\displaystyle \mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Cr}=24, \mathrm{Mn}=25$ and $\displaystyle \mathrm{Zn}=30$ )