AlBr₃ - Aluminum Tribromide:

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 AlBr₃ is trigonal planar with symmetric charge distribution around the central atom.
Therefore this molecule is nonpolar.

Aluminum Tribromide on Wikipedia.
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