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Is the substance an atom or a molecule?
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Is the substance an atom or a molecule?

User Duha
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Answer:

A pair of oxygen atoms is a molecule of oxygen. A molecule is the smallest particle of a substance that exists independently. Molecules of most elements are made up of only one of atom of that element. Oxygen, along with nitrogen, hydrogen, and chlorine are made up of two atoms.

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User Dabo
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