A transition metal '$\mathrm{M}$' among $$\mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}$$ and $\mathrm{Fe}$ has the highest second ionisation enthalpy. The spin-only magnetic moment value of $\mathrm{M}^{+}$ ion is $\underline{\hspace{2cm}}$ BM (Near integer) (Given atomic number $$\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}: 24, \mathrm{Mn}: 25, \mathrm{Fe}: 26$$)