What happens to molecules in a liquid when it becomes a solid?

Liquid molecules generally have spaces in between them. Molecules in liquids move freely compared to solid molecules. When a liquid turns into a solid its molecules organize in a specific arrangement that take up more space. This freezing process makes molecules act closer together forming a compact solid structure. It is important to note that the number of molecules in solid water is still the same; the order in which they are arranged only differs. Due to this solid water becomes less dense than liquid water.

Since the liquid becomes a solid all the molecules will then begin to stick together and wont move out of its place.