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Atoms! All matter is composed of atoms. Whether it's a pure sample of an element, a compound, or a mixture; solid, liquid, or gas, it all comes down to atoms. The word atom was coined by a Greek thinker named Democritus, who was the first to theorize that all matter was made up of some kind of indivisible particle, which he called "atomos," meaning indivisible. Thanks, Democritus!

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