ValenceShellElectronPairRepulsionTheoryPlanar triangularTetrahedralTrigonal bipyramidalOctahedralVSEPR 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 AXY, where Y is the # of peripheral atoms• AX2= linear• AX3= planar triangular• AX4
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