BF₃ - Boron Trifluoride:

First draw the Lewis dot structure:

Electron geometry: trigonal planar. Hybridization: sp²

Then draw the 3D molecular structure using VSEPR rules:
  Click and drag the molecle to rotate it.

Decision:
The molecular geometry of BF₃ is trigonal planar with symmetric charge distribution on the central atom.
Therefore BF₃ is nonpolar.

More info on boron trifluoride (BF₃) at wikipedia: Wikipedia Boron Trifluoride.
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