Xenon
Xenon, an element that takes the form of an odorless, colorless, tasteless gas. It makes up about 1/11,000,000 of the air. Xenon was the first of the inert gases (ones that ordinarily will not form compounds) to be combined chemically with another element, in 1962. Xenon is used in electron and luminescent tubes. The element was discovered in 1898 by Sir William Ramsay and M. W. Travers.
Symbol: Xe. Atomic number: 54. Atomic weight: 131.29. Melting point: -169.42F. (-111.9C.). Boiling point: -162.4F. (-108C.). Specific gravity: gas, 4.53 (air=1); liquid, 3.52 (water=1). Xenon belongs to Group 0 (Inert Gases) of the Periodic Table and has a valence of 0.