Molecular Geometry.

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Presentation transcript:

Molecular Geometry

VSEPR Theory and Shapes Valence Shell Electron Pair Repulsion Theory Three dimensional shapes of molecules can be predicted using Lewis structures Shapes are determined by considering groups of electrons around central atom, both bonded and unbonded (lone pairs) Electron groups are arranged to minimize the repulsion between their negative charges Focus on central atom, number of bonds and number of lone pairs

VSEPR Theory and Shapes Central atoms with two electron groups: minimal repulsion when electron groups are on opposite sides of central atom LINEAR

VSEPR Theory and Shapes Central atoms with three electron groups Example: H2CO Minimal repulsion occurs when three electron groups are as far apart as possible- TRIGONAL PLANAR

VSEPR Theory and Shapes SO2 there are three electron groups, but one group is a lone pair, so the shape is bent

VSEPR Theory and Shapes Four electron groups When all of the electron groups are bonded, the shape is tetrahedral

VSEPR Theory and Shapes Four electron groups with one lone pair- trigonal planar

VSEPR Theory and Shapes Four electron groups, two lone pairs

VSEPR Theory and Shapes

VSEPR Shapes

Summary https://www.youtube.com/watch?v=KjoQHqgz da8 https://www.youtube.com/watch?v=wYZg1j7o2 x4&ebc=ANyPxKryVMXWuhz6cg_UxEfwZHCa7yI LX5elCuThuVg2h45P6bPR- UTe_bw3tO35eWdvZu7JSpJf7TmC3o129mvZ33r3 FQ5wCA