ES - CI3.2 The Shapes of Molecules

Electron Pair Repulsions

• 109 degree angle arises if the molecule has a tetrahedral shape eg. methane

Key:

--- = bond on the plane of the paper
- - - = bond behind the plane of the paper
triangle = bond in front of the plane of the paper 

• Groups of electrons in the outer shell repel one another and move as far apart as possible

Lone Pairs

• Some molecules have …