What are the features of the molecular structure of gases, liquids and solids?

Gas molecules, if nothing restricts them, scatter, since the distance between gas molecules is much greater than the size of the molecules themselves and the attraction of gas molecules is small, the average kinetic energy of gas molecules is sufficient to do the job of overcoming the forces of molecular attraction. In liquids and solids, molecules are located much closer to each other than in gases. The average kinetic energy of the molecules in them is insufficient to perform the work to overcome the forces of molecular attraction, so the molecules in liquids and solids do not move far from each other.