# Why is BF_3 considered to be a non-polar molecule, any yet B-F bonds are polar?

Molecular polarity results from the $\text{vector sum}$ of the individual bond dipoles.
We know (i) the the $B - F$ bond is polar; and (ii) that the $\angle F - B - F$ bond angles are 120""^@. When the individual bond dipoles are summed in a vector fashion, the resultant is necessarily $0$. Thus boron trifluoride is non-polar. Capisce?