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Valence Shell Electron Pair Repulsion Theory
VSEPR Valence Shell Electron Pair Repulsion Theory “Atomium Building”, Andre Waterkeyn (architect), 1958
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VSEPR Theory Atoms and lone pairs in molecules arrange themselves to minimize repulsion.
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Make a Table Geom. Name # of bonded atoms to central atom
Ball and Stick Model # of bonded atoms to central atom # of lone pairs on central atom Electron Domain Geometry Bond Angles Ex. Dot. Struct
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Linear 2 180o GeomName Model # of bonded atoms # of lone pairs
Bond Angles Ex. Dot. Struct See next slide 2 180o BeH2 Linear
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Trigonal Planer 3 120o GeomName Model # of bonded atoms
# of lone pairs Bond Angles Ex. Dot. Struct See next slide Trigonal Planer 3 120o BH3
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Tetrahedral 4 GeomName Model # of bonded atoms # of lone pairs
Bond Angles Ex. Dot. Struct See next slide 4 CH4 Tetra-hedral 109.5o
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Trigonal Pyramidal 3 1 107o GeomName Model # of bonded atoms
# of lone pairs Bond Angles Ex. Dot. Struct See next slide Trigonal Pyramidal 3 1 107o NH3
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Bent 2 2 GeomName Model # of bonded atoms # of lone pairs Bond Angles
Ex. Dot. Struct See next slide 2 2 H2O Bent 104.5o
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Trigonal Bipyramidal 5 GeomName Model # of bonded atoms
# of lone pairs Bond Angles Ex. Dot. Struct See next slide Trigonal Bipyra-midal 120o and 90o 5 PCl5
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Octahedral 6 90o GeomName Model # of bonded atoms # of lone pairs
Bond Angles Ex. Dot. Struct See next slide Octa-hedral 6 90o SF6
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