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An atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negativity charged electrons.

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A mixture is a substance made by combining two or more different materials in a such way that no chemreaction occurs.

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A compound is a thing that is composed of two or more separate elements.

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An element is a pure substance made from one type of atom.

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Compounds are unique by they can only be separated by chemical change