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Valence shell electron pair repulsion (VSEPR) theory (/ ˈ v ɛ s p ər, v ə ˈ s ɛ p ər / VESP-ər, [1]: 410 və-SEP-ər [2]) is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms. [3]
However, the later edition in 1959 failed to adequately address the problems that appeared to be better understood by molecular orbital theory. The impact of valence theory declined during the 1960s and 1970s as molecular orbital theory grew in usefulness as it was implemented in large digital computer programs.
Iodine heptafluoride is an interhalogen compound with the chemical formula I F 7. [2] [3] It has an unusual pentagonal bipyramidal structure, with D 5h symmetry, as predicted by VSEPR theory. [4]
That is, the VSEPR theory gives the wrong answer for this molecule, as first noted in 1971 by Peterson et al. who determined the experimental structure. So I think it is misleading to put this molecule on EITHER line. Placing it at n=8 is misleading because the VSEPR model is based on simple electron counting which gives n=9.
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In chemistry, ligand close packing theory (LCP theory), sometimes called the ligand close packing model describes how ligand – ligand repulsions affect the geometry around a central atom. [1] It has been developed by R. J. Gillespie and others from 1997 onwards [ 2 ] and is said to sit alongside VSEPR [ 1 ] which was originally developed by R ...
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