While Lewis Structures are a nice way to represent bonding in molecules, they fail to indicate the 3-Dimmensional shapes molecules exhibit. This means we need to develop another way to represent molecules in 3-Dimmensions. The theory used to do this is called the Valence Shell Electron Pair Repulsion Theory or VSEPR.
9.1 – 9.2 Molecular Shapes and VSEPR