Valence Shell Electron Pair Repulsion (VSEPR) Theory

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Presentation transcript:

Valence Shell Electron Pair Repulsion (VSEPR) Theory Valence shell electrons will arrange themselves about a central atom so that replusions among them are as small as possible Used to determine the Molecular Geometry (Shape) of a molecule (Lewis Dot structures only give us the order of bonding) Count the # of regions of high electron density: a region of high e- density is a bond (single, double or triple) or a lone pair.

CO2 Lewis Dot Structure VSEPR O=C=O only tells us the bonding and not the Geometry VSEPR # of high e- density regions around the central atom 2 bonds and 0 lone pairs Linear O=C=O OCO  180o Therefore, the Molecular Geometry (Shape) is linear

BF3 Lewis Dot Structure VSEPR # of high e- density regions around the central atom 3 bonds and 0 lone pairs Trigonal Planar FBF  120o  the Molecular Geometry (Shape) is Trigonal Planar

CH4 Lewis Dot Structure VSEPR # of high e- density regions around the central atom 4 bonds and 0 lone pairs Tetrahedral HCH  109.5o  the Molecular Geometry (Shape) is Tetrahedral C H

PF5 Lewis Dot Structure VSEPR # of high e- density regions around the central atom 5 bonds and 0 lone pairs Trigonal Bipyramidal FPF 90.0o & 120.0o & 180.0o  the Molecular Geometry (Shape) is Trigonal Bipyramidal P F

SF6 Lewis Dot Structure VSEPR # of high e- density regions around the central atom 6 bonds and 0 lone pairs Octahedral FSF 90.0o & 180.0o  the Molecular Geometry (Shape) is Octahedral F F F S F F F