Worksheet 15

Worksheet 15 - Worksheet 15 - Molecular Shapes The shapes...

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Worksheet 15 - Molecular Shapes The shapes of molecules can be predicted from their Lewis structures by using the VSEPR ( V alence S hell E lectron P air R epulsion) model, which states that electron pairs around a central atoms will assume a geometry that keeps them as far apart from each other as possible. This is illustrated by the drawings below. How does this apply to Chemistry? The groups occupying these geometric positions will be either atoms bonded to the central atom, or lone pair electrons on the central atom. Lone pair electrons occupy more space than bonded electrons, so they will take the equatorial position in the trigonal bipyramid . Lone pair electrons will also occupy positions that put them as far apart from each other as possible. Six groups surrounding a central atom will form an octahedron . All of the groups in this structure are at 90 o or 180 o to each other. All positions are equivalent Five groups will form a trigonal bipyramid . The two positions pointing up and down are called the
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This note was uploaded on 12/05/2011 for the course CHEM 231 taught by Professor Beck during the Spring '11 term at Indiana.

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Worksheet 15 - Worksheet 15 - Molecular Shapes The shapes...

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