It is usually said that molecules are spherical in shape, that is what we learn from our text books. May be what they are saying is true but only in the case of a monatomic molecule. If one considers a diatomic molecule there are two atoms that means two spheres and if it is polyatomic there is no doubt there are many spheres attached to one another. If that is the case polyatomic molecules are never really spherical! Please clear my this confusion.