$B$ can not form $\left[\mathrm{BF}_{6}\right]^{3-}$ but can form only $\left[\mathrm{BF}_{4}\right]

Question

$B$ can not form $\left[\mathrm{BF}_{6}ight]^{3-}$ but can form only $\left[\mathrm{BF}_{4}ight]^{-}$while Al can form $\left[\mathrm{AlF}_{6}ight]^{3-}$ ions. This is because\

Professor PC Thomas Classes · Answer

B can form only $\left[\mathrm{BF}_{4}\right]^{-}$while Al can form $\left[\mathrm{AlF}_{6}\right]^{3-}$ ions. This is because B has no d-orbitals but Al has d-orbitals