Final answer:
The molecular geometry of PF3 is trigonal pyramidal, and it is a polar molecule due to the dipoles from the P-F bonds not canceling out.
Step-by-step explanation:
The molecular geometry of the PF3 molecule is trigonal pyramidal, and this molecule is polar. PF3 has three nuclei and one lone pair, adopting a geometry similar to a tetrahedron with one vertex missing, which is the definition of a trigonal pyramidal shape. Furthermore, because the dipoles arising from the P-F bonds do not cancel each other out in this less-than-symmetrical molecular geometry, PF3 has a nonzero dipole moment, making it a polar molecule.