Krypton (Kr)

Krypton gas purity 99,999%

Name                                       Krypton
Symbol                                    Kr
Atomic number                       36
Molecular weight                    83,8 g/mol
Group number                        18
Group name                            Rare gases
CAS registry ID                       7439-90-9
UN number                              UN 1056

History & Occurrence

Xenon (from the Greek word ξένος, meaning “strange”) was discovered in England by William Ramsay and Morris Travers. They found it in the residue left over from evaporating components of liquid air.

Krypton (chemical symbol Kr, atomic number 36) is a colorless, odorless, tasteless noble gas. It occurs in trace amounts in the atmosphere and is isolated by fractionating liquefied air. Krypton is inert for most practical purposes, but it is known to form compounds with fluorine. Krypton can also form “clathrates” (cage-like molecules) with water, when atoms of the element are trapped in a lattice of water molecules.


Krypton is used in the fanciest, most energy-efficient double-pane insulated windows.
Krypton is also used in certain fluorescent lamps and in a flash lamp employed in high-speed photography. Radioactive krypton-85 is useful for detecting leaks in sealed containers, with the escaping atoms detected by means of their radiation.