The electron geometry ("Electronic Domain Geometry") for PF3 is tetrahedral.
The molecular geometry, on the other hand, is Trigonal Pyramidal.
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trigonal bipyramidal, there are 5 e- by VSEPR method
It has a bent structure just like the H2O and H2S.
Its actually electron pair repulsion. Its the principle that electron pairs around a central atom tend to orient themselves as far apart as possible. Electron pair repulsion is used to predict the geometry of a molecule or a polyatomic ion.
Trigonal Pyramidal resulting from 3 bonded pairs and 1 non-bonded pair
They can use geometry by using angles and certain polygons/polyhedra.