XeO3 - Xenon Trioxide:

First draw the Lewis dot structure:
XeO3 Lewis Structure
Electron geometry: tetrahedral. Hybridization: sp3

Then draw the 3D molecular structure using VSEPR rules:

The molecular geometry of XeO3 is trigonal pyramidal with asymmetric charge distribution on the central atom.
Therefore this molecule is polar.

Xenon Trioxide on Wikipedia.

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