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V alence S hell E lectron P air R epulsion Theory Planar triangular Tetrahedral Trigonal bipyramidal Octahedral

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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)

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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 = tetrahedral (tetra = 4 faces) AX 5 = trigonal bipyramidal (2 pyramids) AX 6 = octahedral (octa = 8 faces) Work on handout (follow instructions on sheet)

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Planar triangular Tetrahedral Trigonal bipyramidalOctahedral

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See tomorrows lesson for the remaining slides from todays handout For more lessons, visit

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