All matter is made up of very small particles called atoms. Atoms are the building blocks of all matter. When a substance contains only one type of atom, it is called an element. ... An element is a pure substance and is made of only one type of atom; it cannot be broken down into a simpler substance.
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element is the answer.
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All matter is made up of very small particles called atoms. Atoms are the building blocks of all matter. When a substance contains only one type of atom, it is called an element. ... An element is a pure substance and is made of only one type of atom; it cannot be broken down into a simpler substance.