Atom - basic unit the basic unit of matter that cannot be broken down further by chemical means, Gas - state of matter; nonrigid structure, no definite shape, no definite volume, particles move freely, kinetic energy - energy of motion, liquid - state of matter; nonrigid structure, no definite shape, definite volume, particles slide past each other, molecule - a particle composed of two or more atoms joined together, shape - form of a substance, solid - state of matter; rigid structure, definite shape, definite volume, particles vibrate in place, structure - arrangement of particles in a substance, volume - amount of three-dimensional space a substance occupies,

6.6A Solid, Liquid, Gas

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