Structure of phosphorus pentafluoride, PF5. There are five bonded domains on P and no lone pairs, giving trigonal pyramidal electron-domain and molecular geometries.

Shown below is a trigonal bipyramid, the geometric shape for which the term "trigonal bipyramidal geometry" was derived. There are three "equatorial" electron domains which lie in the same plane as the central P atom, forming a trigonal planar structure. The two remaining electron domains are at 90 degree angles to the trigonal plane. By themselves, the two axial electron domains and the central atom form a linear structure, with the two axial electron domains separated by a 180 degree angle.




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