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What is the VSEPR shape of the molecule ##PF_3##?
The VSEPR shape of the molecule ##"PF"_3## is trigonal pyrimidal.
We can use VESPR theory to predict a trigonal pyrimidal shape for the molecule ##PF_3## because of its ##AX_3E## status.
VESPR stands for valence shell electron pair repulsion. This theory basically says that and non-bonding electron pairs of the central atom in a molecule will repel (push away from) each other in three dimensional space and this gives the molecules their shape.
We can use the following notations when examining a Lewis structure of a molecule. A = central atom X = peripheral atoms E = non-bonding electron pairs of the central atom
##AX_2## = linear molecule ##AX_3## = trigonal planar ##AX_3E## = trigonal pyrimidal ##AX_2E_2## = bent ##AX_4## = tetrahedral molecule
