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V alence S hell E lectron P air R epulsion Theory

V alence S hell E lectron P air R epulsion Theory. Planar triangular. Tetrahedral. Trigonal pyramidal. Bent. Molecular Shape. VSEPR theory assumes that the shape of a molecule is determined by the repulsion of electron pairs. VSEPR Theory. Based on Electron Dot (Lewis structures)

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V alence S hell E lectron P air R epulsion Theory

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  1. ValenceShellElectronPairRepulsionTheory Planar triangular Tetrahedral Trigonal pyramidal Bent

  2. Molecular Shape VSEPR theory assumes that the shape of a molecule is determined by the repulsion of electron pairs.

  3. VSEPR Theory • Based on Electron Dot (Lewis structures) • Theory predictsshapesof compounds • abbreviated VSEPR • VSEPR (pronounced “vesper”) stands for Valence Shell Electron Pair Repulsion • VSEPR predicts shapes based on electron pairs repelling (in bonds or by themselves) • Electronsaround central nucleus repeleach other. So, structures have atoms maximally spread out

  4. VSEPR overview • Each shape has a name (you will have to know these) • Names of Shapes: • tetrahedral • trigonal pyramidal • Bent • Linear • trigonal planar

  5. Models Tetrahedral Triangular Planar Bent or V Linear Trigonal pyramidal

  6. 109.5° methane, CH4 Tetrahedral Bonds are all evenly spaced electrons

  7. .. .. .. .. ammonia NH3 Trigonal Pyramidal Less repulsion between the bonding pairs of electrons

  8. .. .. 109.5° (104.5°) 109.5° (107°) 109.5° (109.5°) .. water, H2O

  9. .. .. ..

  10. Bent or V 2 unshared pairs of e’s at top of O repel bonds and force them to bend

  11. 4 Tetrahedral Trigonal Pyramidal 4 (3 shared 1 lone pair)

  12. Bent or V 4 (2 shared 2 lone pairs) Linear CO2 2

  13. Linear 2 Trigonal Planar 3

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