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n. A colorless, odorless, highly unreactive gaseous element found in minute quantities in the atmosphere, extracted commercially from liquefied air and used in stroboscopic, bactericidal, and laser-pumping lamps. Atomic number 54; atomic weight 131.29; melting point -111.9°C; boiling point -107.1°C; density (gas) 5.887 grams per liter; specific gravity (liquid) 3.52 (-109°C). See Table at element.

n. A heavy, gaseous chemical element (symbol Xe) of the noble gases group with an atomic number of 54.

n. A very heavy, inert gaseous element of the noble gas group, occurring in the atmosphere in the proportion of one volume is about 20 millions. It was discovered by Ramsay and Travers in 1898. It can be condensed to a liquid boiling at -107° C., and to a solid which melts at -111.9° C. Symbol Xe (formely also X); atomic number 54; atomic weight 131.3.

n. In chem., the heaviest of the five recently discovered elementary substances present in gaseous form in the atmosphere.

n. a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts

"While krypton has a considerable vapour pressure at the temperature of boiling air, the vapour pressure of xenon is hardly appreciable; hence their separation, although tedious, presented no particular difficulty."

chemical element    element    inert gas    argonon    noble gas   

perxenate   

krypton    argon    halogen    neon    fluorine    norbornyl    acetylene    subgroup    methane    ruthenium