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VSEPR-handout - Valence Shell Electron Pair Repulsion...

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V alence S hell E lectron P air R epulsion Theory Planar triangular Tetrahedral Trigonal bipyramidal Octahedral VSEPR Theory • Based on Lewis structures we can know the shape or “geometry” of molecules • The theory that predicts geometry (based on Lewis structures) is abbreviated VSEPR • VSEPR (pronounced “vesper”) stands for Valence Shell Electron Pair Repulsion • VSEPR, as the name suggests, predicts geometry based on the repulsion of electron pairs (in bonds or by themselves) • Electrons around the central nucleus repel each other. Thus, resulting structures have atoms maximally spread out (balloon demo) VSEPR overview • The balloons represent electron clouds. At the end of each balloon will be a peripheral atom. The balloons meet at a central atom. • Each shape containing 2-6 peripheral atoms has a name (you will have to know these) • Sometimes the molecules are represented by AX Y , where Y is the # of peripheral atoms • AX 2 = linear • AX 3 = planar triangular • AX 4
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