An Atom is the smallest unit of matter that defines the chemical elements. The Alliance of Four Great Races used atoms as a form of communication in their database on Heliopolis. (SG1: "The Torment of Tantalus")
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| Adarite • Alkaline • Ammonia • Argon • Asgard alloy • Atom • Barium • Beryllium • Boron • Cadoliin • Calcium carbonate • Carbon • Carbon dioxide • Carbon monoxide • Carocev • Charcoal • Chlorine • Coal • Cyanide • Deuterium • Diamond • Diesel • Emerald • Fodinaire • Gas • Gasoline • Gold • Granite • Gypsum • Halon gas • Heavy water • Helium • HU-2340 • Hydrochloric acid • Hydrogen • Iodine • Iridium • Iron • Kevlar • Lead • Lime • Liquid hydrogen • Liquid Naquadah • Liquid nitrogen • Lithium hydride • Marble • Methane • Naquadah • Naquadria • Nethemia • Neutronium • Nezanat • Nickel • Nitrogen • Novus CO2 scrubber substance • Olesian ore • Oxygen • Palladium hydride • Papyrus • Plutonium • Potassium • Potassium nitrate • Salt • Silicon • Silver • Steel • Sulfur • Sulfur dioxide • Sulfur dioxide microbe • Tetrachloroethylene • Titanium • Trinium • Uranium • Water • Wood • Xenon | |