What is a VSEPR model? What does VSEPR stand for?
VSEPR is a simple model to determine the shapes of molecules
based upon the premise that the molecule will tend to
place pairs of valence shell electrons (both bonding and
nonbonding) as far apart as possible so as to minimize
the electron-eleton pair repulsion energy. It works in
many simple cases... e.g. it predicts that CO2 is linear
and H2O is bent.
VSEPR: Valence Shell Electron Pair Repulsion
Check the bonding chapters in any good college-level
general chemistry textbook.