Best Answer: PF3 has 4 electron domains with 3 bonding pairs and one non-bonding pair. It therefore cannot be a tetrahedral shape, nor a trigonal planar (only for 3 bonding domains with no lone pairs of electrons). So we duduce it has a molecular geometry of trigonal pyramidal. read more
The electron geometry ("Electronic Domain Geometry") for PF3 is tetrahedral. The molecular geometry, on the other hand, is Trigonal Pyramidal. read more