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Valence Shell Electron Pair Repulsion (VSEPR) Theory
The basic principle of the Valence Shell Electron Pair Repulsion (VSEPR) theory:
Each group of valence electrons around a central atom is located as far as possible from the others in order to minimize repulsions.

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Each type of model is made of:
A — central atom
X — ligand (bonding electron pair)
E — nonbonding electron pair
The five basic molecular shapes:
• linear
• trigonal planar
• tetrahedral
• trigonal bipyramidal
• octahedral
The Integrated Data Sources for ChemicalData were very helpful in finding multiple examples for the various types of VSEPR models.


"Valence Shell Electron Pair Repulsion (VSEPR) Theory" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/ValenceShellElectronPairRepulsionVSEPRTheory/
Contributed by: Guenther Gsaller
Based on: Polytopes Package in Mathematica
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