The geometry of molecules

The Gillespie model (V.E.S.P.R. model)

The Gillespie model (VESPR model) is an empirical and very simple method that permits to determine the type of geometrical structure of a given molecule: The "groups" are counted: - First search for the central atom. - Then write the Lewis structure ( don't forget the lone pairs ): - Every atom attached to the central atom by single, double or triple bond counts for one "group" - Every lone pair counts for one "group" Then determine the structure by the number of "groups": 2  linear 3  trigonal planar 4  tetrahedral 5  trigonal bipyramidal 6  octahedral


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