define molecules and it's uses
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A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. ... For example, O2 is the oxygen molecule most commonly found in the earth's atmosphere; it has two atoms of oxygen.
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a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
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