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Atoms are the smallest possible units of PURE substances called elements. There are are only about 118 elements known to exist.

When atoms of different elements join together chemically (they share electrons between each other), they form a new substance called a compound. The smallest possible unit (or joined up atoms) of a compound is called a molecule. There are potentially hundreds of thousands of compounds.

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Q: Why do atoms make up molecules but molecules don't make up atoms?
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