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chem 211 3 notes

chem 211 3 notes - VSEPR model Valence shell electron pair...

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VSEPR model Valence shell electron pair repulsion model extends lewis structure to a molecular model Electrons want to be as far apart as possible In naming molecules, only consider atoms themselves, not lone pairs Does not distinguish between single and multiple bonds With more than one central atom, consider bonding around each atom independently W/ lone pairs n m AX E used to identify different combinations of lone pairs and atoms attached to central atom lone pairs have stronger repelling effect than bonded pairs L-L> L-B> B-B Summary of VSEPR: - regions of high electron concentrations spread out to maximize separations (bonds, lone pairs) - bonds repel each other the same amount, regardless of single, double, etc - bonding around central atom is independent of whether there are more than one central atoms in a molecule - lone pairs continue to shape, but not to naming of shape - lone pairs repel more strongly, tend to compress bond angles lone pairs can go on axial plane or equatorial plane…go for plane w that produces lowest energy (repells fewer number of atoms) Polar molecules
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