What state of matter has particles that are close together and touching each other in a regular repeating pattern? They vibrate about fixed positions but do not move apart.

The state of matter you are referring to is solid. In solids, the particles are arranged closely together in a fixed and orderly pattern. This close arrangement allows them to touch each other, creating a strong intermolecular force that keeps them in place.

Particles in a solid vibrate around their fixed positions but do not move freely. This is why solids maintain a definite shape and volume. The vibrations are typically minimal compared to the movement of particles in liquids or gases, which means the overall structure of the solid remains stable.

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