What is the origin of electromagnetic interaction between molecules? Anyway, it should have some relation with atoms. Also, These electromagnetic interactions are playing a major role in different properties of matter including the transition between solid-liquid-gas. Hence, what would be the source of these interactions..?
If these interactions originate from atoms, then some other questions come into focus:
Are they related to the transition of electrons between various energy levels and emission of photons from an atom..?
Are they related to cohesive forces between molecules in solids & liquids?