This post is an introduction to VSEPR theory and provides an overview up to 4 domains.
Learning objective:understand basic molecular geometries and the relation of these shapes to Lewis Dot Structure.
The fact is that the shapes of molecules play an enormous role in how the chemicals interact and form molecules. The other major factor is energy (but will get to that in a later post).
The basic idea is that electron clouds repel each other. So the orbitals try to move as far from other orbitals as they can. This ‘mutual repulsion’ (sounds awful), results in some very basic shapes which molecules form.
This theory is known as Valence Electron Shell