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Gases are composed of an atomic element or an atomic molecule. Oxygen is O2 a molecule, as is CO2 carbon dioxide. Xenon, Xe is an atom, as is Hydrogen, H. The isotope is named protium, but almost always called hydrogen. A gas can be a molecule or an atom.

Our most common gaseous mixture, our atmosphere is composed of many, many gases. Some are elements, like Nitrogen and Argon, and others like Oxygen, Carbon Dioxide and Carbon Monoxide (a man made pollutant) are molecules.

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15y ago

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