SeF₆ - Selenium Hexafluoride:

First draw the Lewis dot structure:

Electron geometry: octahedral. Hybridization: sp³d²

Then draw the 3D molecular structure using VSEPR rules:


Decision:
The molecular geometry of SeF₆ is octahedral with symmetric charge distribution on the central atom.
Therefore this molecule is nonpolar.

Selenium Hexafluoride on Wikipedia.

Back to Molecular Geometries & Polarity Tutorial: Molecular Geometry & Polarity Tutorial.

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