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Atom

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The smallest unit of an element that maintains the properties of that element

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Element

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a substance that cannot be separated or broken down into simpler substances by chemical means

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Molecule

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a group of atoms that are held together by chemical forces

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Compound

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a substance made up of atoms of two or more different elements joined by chemical bonds

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Mixture

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a combination of two or more substances that are not chemically combined

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Pure Substance

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a sample of matter, either a single element or a single compound, that has definite chemical and physical properties

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Matter

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Anything that has mass and takes up space

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Mass

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The amount of matter in an object

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Volume

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The amount of space that an object occupies

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density

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The amount of mass that is packed into a given volume