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science

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1Moleculea group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
2Protona stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
3Matterphysical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
4VolumeAn amount of three dimensional space, often used to describe the space that an object takes up.
5Atomthe basic unit of a chemical element.