* Solids: The particles in a solid are indeed packed very closely together. They have a fixed shape and volume because the particles are held in place by strong attractive forces. They vibrate but don't have enough energy to move freely like liquids or gases.

* Liquids: Liquids have particles that are closer together than gases but further apart than solids. They have a fixed volume but can flow and take the shape of their container. The particles in a liquid move around more freely than in a solid.

* Gases: Gases have widely spaced particles that move rapidly and randomly. They have no fixed shape or volume, taking the shape and volume of their container.

So, to answer your question directly:

* Solid particles are packed closer together than liquid or gas particles.

* They move less than particles in liquids and gases.

Let me know if you have more questions!