10/27/2011 1 Molecular Geometry and Bonding Theories 7 7.1 VSEPR Model 7.2 Molecular Geometry and Polarity 7.4 Hybridization of Atomic Orbitals 7.5 Hybridization of Molecules Containing Multiple Bonds 7.6 Molecular Orbital Theory A is the central atom surrounded by xB atoms. xcan have integer values of 2 to 6. ABx Molecular Geometry Molecular shape can be predicted by using the valence-shell electron-pair repulsion (VSEPR)model. The VSEPR Model Electrons, being negatively charged, repel each other and are most stable when they are separated as much as possible. Electrons are found in various domains. Lone pairs Single bonds Double bonds Triple bonds 2 double bonds 2 electron domains (on central atom) 1 single bond 1 double bond 1 lone pair 3 electron domains (on central atom) 3 single bonds 1 lone pair 4 electron domains (on central atom) Electron-Domain Geometry and Molecular Geometry The basis of the VSEPR model is that electrons repel each other. Electrons will arrange themselves to be as far apart as possible. Arrangements minimize repulsive interactions. 2 electron domains Linear 3 electron domains Trigonal planar Electron-Domain Geometry and Molecular Geometry 5 electron domains Trigonal bipyramidal 6 electron domains Octahedral 4 electron domains Tetrahedral
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