SiH4 - Silicon Tetrahydride, better known as Silane:
First draw the Lewis dot structure:
Electron geometry: tetrahedral. Hybridization: sp3
Then draw the 3D molecular structure using VSEPR rules:
The molecular geometry of SiH4 is tetrahedral with symmetric charge distribution around the central atom.
Therefore this molecule is non-polar.
Silicon Tetrahydride on Wikipedia.
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