106moleculargeometry

106moleculargeometry - Molecular Geometry Glenn V. Lo...

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    Molecular Geometry Glenn V. Lo Department of Physical Sciences Nicholls State University
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    VSEPR VSEPR = “valence shell electron pair  repulsion” – theory used to predict shapes of  molecules Groups of electrons around an atom tend to be  oriented as far away as possible from one another Each of these counts as one group: a single bond,  a lone pair, a double bond, or a triple bond Steric Number = number of groups around an  atom
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    Steric Number What is the steric number around each atom  in the structure shown for urea? What are the  bond angles?
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    Steric Number = 2 Two groups of electrons tend to be  oriented 180 o   apart
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    Steric Number = 2 Example: BeH 2
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    Steric Number = 3 Three groups of electrons tend to be  oriented 120 o   apart
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    Steric Number = 3 Example: carbonate ion http://www.molecules.org/Images/animations/CO32_.html
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    Steric Number = 3 Example: nitrite http://www.molecules.org/Images/animations/NO2_.html
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    Steric Number = 3 Example: formaldehyde http://www.gb.nrao.edu/~glangsto/dr21/FORMALDEHYDE.GIF
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106moleculargeometry - Molecular Geometry Glenn V. Lo...

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