ClF3 - Chlorine Trifluoride:

First draw the Lewis dot structure:
ClF3 Lewis Structure
Electron geometry: trigonal bipyramidal. Hybridization: sp3d

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

Decision:
The molecular geometry of ClF3 is T-shaped with asymmetric charge distribution around the central atom.
Therefore ClF3 is polar.

Chlorine Trifluoride on Wikipedia.

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