10.14 - Chemistry 102B Discussion Worksheet#13 Valence...

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Chemistry 102B – Discussion Worksheet #13 Valence Shell Electron Pair Repulsion (VSEPR) Model 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 atom will assume a geometry that keeps them as far apart from each other as possible. There are five base geometries: Octahderal - Six groups surrounding a central atom will form an octahedron. All of the groups in this structure at 90 ° or 180 ° to each other. All positions are equivalent. Trigonal bipyramid – Five groups will form a trigonal bipyramid. The two positions pointing up and down are called axial positions. They are 180 ° to each other, and at 90 ° to the other three, equatorial positions. The three equatorial positions are at 120 ° to each other. There is more room in the equatorial positions, and large groups will occupy these positions. Tetrahedral –
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10.14 - Chemistry 102B Discussion Worksheet#13 Valence...

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