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Revision as of 22:48, 10 September 2001 by Dave McKee (talk | contribs)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)An chemical element, in the periodic table Argon has the symbol Ar and atom number 18.
One of the noble gases in period 8, diatomic Argon makes up about 1% of the Earth's atmosphere. It is used in lighting as it will not react with the filament in a lightbulb even under high temperatures, and other cases where Nitrogen is an unsuitable (semi-)inert gas.