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Kr
Krypton
Atomic no.:
36
Atom. weight: 83.8
Density: 0.0037493
Class:
noble gas
Melting point: -157.2°C
Boiling point: -153.35°C
Colour: colourless
   
Discoverer: Sir William Ramsay und Morris William Travers
Place: London, UK
Year: 1898

The name is derived from the Greek ‘kryptos’, meaning hidden A colourless, odourless gas that is inert to everything but fluorine gas. The isotope krypton 86 has a line in its atomic spectrum that is now the standard measure of length : 1 metre is defined as exactly 1,650,763.73 wavelengths of this line. Krypton is one of the rarest gases in the Earth’s atmosphere, accounting for only 1 part per million by volume.

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