# What sort of material is BF_3?

$\text{Boron trifluoride}$ is a molecular compound, that displays covalent bonding.
$B {F}_{3}$ is conceived to be a weaker Lewis acid than both $B C {l}_{3}$ and $B B {r}_{3}$ for the reason that the lone pairs on fluorine are conceived to donate electron density to the vacant $\text{p-orbital}$ on the boron centre. The boron nucleus is thus less electron-deficient, and this results in reduced Lewis acidity.