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A noble gas element from the periodic table group 0. At room temperature, krypton is a colorless, odorless gas. It does not form stable compounds with any other element. Krypton occurs naturally in the atmosphere at a level of 1.14 ppm. Pure krypton is isolated by fractional distillation of liquid air. Krypton is used as an inert filler in special purpose electric bulbs, such as aircraft approach lamps.

Synonyms and Related Terms

Kr; cripto (It.); Krípton (Port.) kriptón (Esp.)


  • Noncombustible.
  • Can act as an asphyxiant by displacing air.
  • Air Gas: SDS

Physical and Chemical Properties

Composition Kr (atomic no. 36)
CAS 7439-90-9
Melting Point -156.6 C
Molecular Weight atomic wt = 83.80
Boiling Point -152.3 C

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5335
  • Chemical & Engineering News, American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Neil Bartlett, 'Noble Gases' p. 32

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