The spin-only magnetic moment of ${\left[Co{F}_6\right]}^{3-}$ is _____BM. 
[Atomic number of Co = 27]
 

As $F^{-}$ is a weak field ligand, the configuration of Co3+ in the complex is  $t_{2g}^4{e}_g^2$
$\Rightarrow$ 4 unpaired electrons
 $\mu =\sqrt{4\times 6}=4.898BM$