In chemistry a trigonal bipyramid is a molecular geometry with one atom at the center and 5 more at the corners of a triangular dipyramid. This is one of the only cases where bond angles surrounding an atom are not identical (see also pentagonal dipyramid), which is simply because there is no geometrical arrangement which can result in five equally sized bond angles in three dimensions. Isomers with this geometry are able to interconvert through a process called Berry pseudorotation.
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