Krypton Facts

Krypton Chemical & Physical Properties

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Krypton Basic Facts

Atomic Number: 36

Symbol: Kr

Atomic Weight: 83.80

Discovery: Sir William Ramsey, M.W. Travers, 1898 (Great Britain)

Electron Configuration: [Ar] 4s2 3d10 4p6

Word Origin: Greek kryptos: hidden

Isotopes: There are 30 known isotopes of krypton ranging from Kr-69 to Kr-100. There are 6 stable isotopes: Kr-78 (0.35% abundance), Kr-80 (2.28% abundance), Kr-82 (11.58% abundance), Kr-83 (11.49% abundance), Kr-84 (57.00% abundance), and Kr-86 (17.30% abundance).

Element Classification: Inert Gas

Density: 3.09 g/cm3 (@4K - solid phase)
2.155 g/mL (@-153°C - liquid phase)
3.425 g/L (@25°C and 1 atm - gas phase)

Krypton Physical Data

Melting Point (K): 116.6

Boiling Point (K): 120.85

Appearance: dense, colorless, odorless, tasteless gas

Atomic Volume (cc/mol): 32.2

Covalent Radius (pm): 112

Specific Heat (@20°C J/g mol): 0.247

Evaporation Heat (kJ/mol): 9.05

Pauling Negativity Number: 0.0

First Ionizing Energy (kJ/mol): 1350.0

Oxidation States:0, 2

Lattice Structure: Face-Centered Cubic

Lattice Constant (Å): 5.720

CAS Registry Number: 7439-90-9

Krypton Trivia:

  • Sir William Ramsay was awarded the 1904 Nobel Prize in Chemistry for the discovery of the noble gasses, including Krypton.
  • The meter was defined in 1960 as 1,650,763.73 wavelengths of the 605.78 nanometer spectral line from Krypton-86. This standard was replaced in 1983.
  • Krypton is usually inert, but it can form molecules. The first krypton molecule, krypton difluoride (KrF2), was discovered in 1963.
  • Earth's atmosphere has approximately 1 part per million abundance of krypton.
  • Krypton can be obtained by fractional distillation from air.
  • Light bulbs containing krypton gas can produce a bright white light useful for photography and runway lights.
  • Krypton is often used in gas and gas ion lasers.

References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952), CRC Handbook of Chemistry & Physics (18th Ed.) International Atomic Energy Agency ENSDF database (Oct 2010)

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Helmenstine, Anne Marie, Ph.D. "Krypton Facts." ThoughtCo, Jun. 29, 2017, Helmenstine, Anne Marie, Ph.D. (2017, June 29). Krypton Facts. Retrieved from Helmenstine, Anne Marie, Ph.D. "Krypton Facts." ThoughtCo. (accessed May 28, 2018).