PCl3 - Phosphorus Trichloride:First draw the Lewis dot structure:Electron geometry: tetrahedral. Hybridization: sp3Then draw the 3D molecular structure using VSEPR rules:Click and drag the molecle to rotate it. The molecular geometry of PCl3 is trigonal pyramidal with asymmetric charge distribution on the central atom. Therefore this molecule is polar. Phosphorus Trichloride on Wikipedia. Back to Molecular Geometries & Polarity Tutorial: Molecular Geometry & Polarity Tutorial. For homework help in math, chemistry, and physics: www.tutor-homework.com.