Krypton
Krypton, a colorless, odorless, tasteless element. It is a noble, or inert, gas (one that ordinarily will not combine with other elements). Krypton exists in the air to the extent of one part in one million by volume. It is produced commercially by distilling liquid air. The name krypton (Greek for hidden) was given to it by its discoverers, Sir William Ramsay and Morris Travers, in 1898. Krypton is used in some high-speed photographic lamps, incandescent lamps, gas lasers, and, mixed with argon, in some fluorescent lamps.
Symbol: Kr. Atomic number: 36. Atomic weight: 83.80. Specific gravity: gas, 2.87 (air = 1); liquid, 2.6 (water = 1). Boiling point: -241.6 F. (-152 C.). Melting point: -251.14 F. (-157.3 C.). Krypton belongs to Group 0 (Inert Gases) of the Periodic Table and has a valence of 0 or +2.