atom - A small particle that is the building block of matter. Protons, Neutrons, and electrons , molecule - Two or more atoms that are held together , structure - The way matter is arranged , shape - An objects form , kinetic energy - Energy due an objects motion, volume - The amount of space something takes up , solid - matter that has a definite shape and definite volume , liquid - Matter that has a definite volume but no definite shape, gas  - Matter that has no definite shape or volume ,

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