argon

n. gaseous chemical element found in air and volcanic gases

This article pertains to the chemical element. For other uses, see argon (disambiguation). Argon (IPA:) is a chemical element designated by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of the periodic table (noble gases). Argon is present in the Earth's atmosphere at slightly less than 1%, making it the most common noble gas on Earth. Its full outer shell makes argon stable and resistant to bonding with other elements. Its triple point temperature of 83.8058 K is a defining fixed point in the International Temperature Scale of 1990.
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Noun
1. a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
(synonym) Ar, atomic number 18
(hypernym) chemical element, element
(substance-holonym) air

n. argon, Ar, argon, gaseous chemical element found in air and volcanic gases

n. argon, gaseous chemical element found in air and volcanic gases