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Chemistry
121, Winter 2008, LA Tech
Valence-Shell Electron-Pair Repulsion (VSEPR) model (Review)
For predicting shapes of molecules and
polyatomic Ions based on the repulsion of valence pairs of electrons making them as far apart as
possible around an atom of a Lewis structure.
1) Draw the Lewis structure for the molecule or ion.
2) Determine the number of bonding and
unshared pairs attached to the central atom.
One single, double or
triple bond counted as a bonding pair
3) Choose the appropriate case from the given chart.