krypton

A colorless, largely inert gaseous element used chiefly in gas discharge lamps and fluorescent lamps. Atomic number 36; atomic weight 83.80; melting point −157.36°C; boiling point −153.34°C; density 3.733 grams per liter (0°C). cross-reference: Periodic Table.

A chemical element, one of the five recently discovered gaseous constituents of the atmosphere, first obtained by Ramsay and Travers in 1898.

An inert gaseous element of the argon (noble gas) group, of atomic number 36, occurring in air to the extent of about one volume in a million. It was discovered by Ramsay and Travers in 1898. Boiling point, -152.3° C.; melting point, -156.6° C.; symbol, Kr; atomic weight, 83.8.

A chemical element (symbol Kr) with an atomic number of 36; one of the noble gases.

a colorless element that is one of the six inert gasses; occurs in trace amounts in air