![]() The idea of a correlation between molecular geometry and number of valence electron pairs (both shared and unshared pairs) was originally proposed in 1939 by Ryutaro Tsuchida in Japan, and was independently presented in a Bakerian Lecture in 1940 by Nevil Sidgwick and Herbert Powell of the University of Oxford. ![]() Such quantum chemical topology (QCT) methods include the electron localization function (ELF) and the quantum theory of atoms in molecules (AIM or QTAIM). The insights of VSEPR theory are derived from topological analysis of the electron density of molecules. ![]() Gillespie has emphasized that the electron-electron repulsion due to the Pauli exclusion principle is more important in determining molecular geometry than the electrostatic repulsion. Therefore, the VSEPR-predicted molecular geometry of a molecule is the one that has as little of this repulsion as possible. The greater the repulsion, the higher in energy (less stable) the molecule is. The premise of VSEPR is that the valence electron pairs surrounding an atom tend to repel each other. It is also named the Gillespie-Nyholm theory after its two main developers, Ronald Gillespie and Ronald Nyholm. Valence shell electron pair repulsion ( VSEPR) theory ( / ˈ v ɛ s p ər, v ə ˈ s ɛ p ər/ VESP-ər, : 410 və- SEP-ər ) is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms. Shows location of unpaired electrons, bonded atoms, and bond angles. Model for predicting molecular geometry Example of bent electron arrangement (water molecule).
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