Chemistry - CHEMICAL BONDING Question with Solution | TestHub

As Boron does not have d orbital in its valence orbit. Hence, maximum covalency of boron cannot exceed more than 4 so$\mathrm{B}{{\mathrm{F}}_6}^{3-}$does not exist. Rest all exist as Si, S,Al have d- orbitals to exceed covalency more than 4.