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The main substances in air are N2 (nitrogen), O2 (oxygen), CO2 (carbon dioxide), H2O (water), and Ar (argon). Which of these substances are elements? Which are compounds? Which are molecules?

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78% nitrogen, 21% oxygen and 1% other gases

~Hottwizzlers
Ar is elements. H2O and CO2 are compounds. H2O and CO2 and O2 and N2 and Ar are also regarded as molecules.

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