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1. Molecular Geometry

   Linked via "phosphorus pentafluoride"

   Pseudorotation and the Berry Mechanism
   In molecules with trigonal bipyramidal electron geometries, such as phosphorus pentafluoride ($\text{PF}_5$), the five substituents are not static. The axial and equatorial positions are rapidly interconverted via a process known as pseudorotation. This involves a concerted transformation where two equatorial ligands swing through the plane, briefly forming a transient [square py…