Krypton Elemental Symbol
Krypton



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Krypton Krypton Cripto Krípton kriptón Krypton

Krypton Bohr ModelKrypton is a Block P, Group 18, Period 4 element. The number of electrons in each of Krypton's shells is 2, 8, 18, 8 and its electronic configuration is [Ar] 3d10 4s2 4p6. In its elemental form krypton's CAS number is 7439-90-9. The krypton atom has a covalent radius of 116±4.pm and it's Van der Waals radius is 202.pm. Krypton has a concentration about 1 ppm in the atmosphere and can be extracted from liquid air. Krypton was discovered and first isolated by Sir William Ramsay and Morris W. Travers in 1898. The origin of the name Krypton comes from the Greek word kryptos meaning "hidden".

Krypton is not toxic. Krypton information, including technical data, safety data and its high purity properties, research, applications and other useful facts are specified below. Scientific facts such as the atomic structure, ionization energy, abundance on Earth, conductivity and thermal properties are included.


  • Properties
  • Safety Data
  • Research
  • Isotopes
  • Other Elements

Krypton Properties


GENERAL PROPERTIES   PHYSICAL PROPERTIES  
Symbol: Kr Melting Point: -157.36 oC, -251.248 oF, 115.79 K
Atomic Number: 36 Boiling Point: -153.415 oC, -244.147 oF, 119.735 K
Atomic Weight: 83.79 Density: 3000 (85 K) kg m-3
Element Category: noble gases Liquid Density @ Melting Point: 2.413 g·cm−3
Group, Period, Block: 18, 4, p Specific Heat: N/A
    Heat of Vaporization 9.05 kJ mol-1
CHEMICAL STRUCTURE Heat of Fusion 1.64 kJ mol-1
Electrons: 36 Thermal Conductivity: 9.43×10-3  W·m−1·K−1
Protons: 36 Thermal Expansion: N/A
Neutrons: 48 Electrical Resistivity: N/A
Electron Configuration: [Ar]4s23d104p6 Electronegativity: 3.00 (Pauling scale)
Atomic Radius: N/A Tensile Strength: N/A
Covalent Radius: 116±4 pm Molar Heat Capacity: 5R/2 = 20.786 J·mol−1·K−1
Van der Waals radius: 202 pm Young's Modulus: N/A
Oxidation States: 2, 1, 0 Shear Modulus: N/A
Phase: Gas Bulk Modulus: N/A
Crystal Structure: cubic face-centered Poisson Ratio: N/A
Magnetic Ordering: diamagnetic Mohs Hardness: N/A
1st Ionization Energy: 1350.77 kJ mol-1 Vickers Hardness: N/A
2nd Ionization Energy: 2350.39 kJ mol-1 Brinell Hardness: N/A
3rd Ionization Energy: 3565.16 kJ mol-1 Speed of Sound: (gas, 23 °C) 220, (liquid) 1120 m·s−1
       
IDENTIFIERS   MISCELLANEOUS  
CAS Number: 7439-90-9 Abundance in typical human body, by weight: N/A
ChemSpider ID: 5223 Abundance in typical human body, by atom: N/A
PubChem CID: 5416 Abundance in universe, by weight: 40 ppb
MDL Number: MFCD00151310 Abundance in universe, by atom: 0.06 ppb
EC Number: N/A Discovered By: William Ramsay and Morris Travers
Beilstein Number: N/A Discovery Date: 1898
SMILES Identifier: [Kr]  
InChI Identifier: InChI=1S/Kr Other Names: Cripto
InChI Key: DNNSSWSSYDEUBZ-UHFFFAOYSA-N  
       
       
       
       
       


Recent Research & Development for Krypton

  • Claude Degueldre, Cyprian Mieszczynski, Camelia Borca, Daniel Grolimund, Matthias Martin, Johannes Bertsch, X-ray fluorescence and absorption analysis of krypton in irradiated nuclear fuel, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 336, 1 October 2014
  • Youn-Sang Bae, Brad G. Hauser, Yamil J. Colón, Joseph T. Hupp, Omar K. Farha, Randall Q. Snurr, High xenon/krypton selectivity in a metal-organic framework with small pores and strong adsorption sites, Microporous and Mesoporous Materials, Volume 169, 15 March 2013
  • Youn-Sang Bae, Brad G. Hauser, Yamil J. Colón, Joseph T. Hupp, Omar K. Farha, Randall Q. Snurr, High xenon/krypton selectivity in a metal-organic framework with small pores and strong adsorption sites, Microporous and Mesoporous Materials, Volume 169, 15 March 2013
  • Yao Wang, Musab Abdul Razak, D.D. Do, Toshihide Horikawa, Kunimitsu Morishige, D. Nicholson, A computer simulation and experimental study of the difference between krypton adsorption on a graphite surface and in a graphitic hexagonal pore, Carbon, Volume 50, Issue 8, July 2012
  • B. Beeler, B. Good, S. Rashkeev, C. Deo, M. Baskes, M. Okuniewski, First-principles calculations of the stability and incorporation of helium, xenon and krypton in uranium, Journal of Nuclear Materials, Volume 425, Issues 1–3, June 2012B. Beeler, B. Good, S. Rashkeev, C. Deo, M. Baskes, M. Okuniewski, First-principles calculations of the stability and incorporation of helium, xenon and krypton in uranium, Journal of Nuclear Materials, Volume 425, Issues 1–3, June 2012
  • Xiaofeng Tian, Tao Gao, Gang Jiang, Duanwei He, Hongxing Xiao, The incorporation and solution of krypton in uranium dioxide: Density functional theory calculations, Computational Materials Science, Volume 54, March 2012
  • M. Gilbert, C. Davoisne, M. Stennett, N. Hyatt, N. Peng, C. Jeynes, W.E. Lee, Krypton and helium irradiation damage in neodymium–zirconolite, Journal of Nuclear Materials, Volume 416, Issues 1–2, 1 September 2011
  • C. Davoisne, M.C. Stennett, N.C. Hyatt, N. Peng, C. Jeynes, W.E. Lee, Krypton irradiation damage in Nd-doped zirconolite and perovskite, Journal of Nuclear Materials, Volume 415, Issue 1, 1 August 2011
  • Kathleen M. Krause, Matthias Thommes, Michael J. Brett, Pore analysis of obliquely deposited nanostructures by krypton gas adsorption at 87 K, Microporous and Mesoporous Materials, Volume 143, Issue 1, August 2011
  • H.S. Lee, Y.S. Lee, S.H. Seo, H.Y. Chang, The characteristics of the multi-hole RF capacitively coupled plasma discharged with neon, argon and krypton, Thin Solid Films, Volume 519, Issue 20, 1 August 2011

Krypton Isotopes


Naturally occurring krypton has six stable isotopes: 78Kr, 80Kr, 82Kr, 83Kr, 84Kr, and 86Kr.

Nuclide Symbol Isotopic Mass Half-Life Nuclear Spin
78Kr 77.9203648 Observationally Stable 0+
80Kr 79.9163790 Stable 0+
82Kr 81.9134836 Stable 0+
83Kr 82.914136 Stable 9/2+
84Kr 83.911507 Stable 0+
86Kr 85.91061073 Observationally Stable 0+