A
chemical element, in the
periodic table Krypton has the symbol Kr and atom number 36. It is one of the so-called
noble gases, and was discovered by fractionating liquefied air. The name Krypton is from a Greek word meaning "hidden".
It is one of the products of Uranium fission.
Krypton is the name of the fictional birth
planet of Kal-El, better known as
Superman. Krypton orbited a [red giant]
? star, and was destroyed in an explosion that converted much of its mass into
Kryptonite.