Krypton, 36Kr
A krypton-filled discharge tube glowing white
Krypton
Pronunciation/ˈkrɪptɒn/
Appearancecolorless gas, exhibiting a whitish glow in an electric field
Standard atomic weight Ar°(Kr)
Krypton in the periodic table
Atomic number (Z)36
Groupgroup 18 (noble gases)
Periodperiod 4
Block  p-block
Electron configuration[Ar] 3d10 4s2 4p6
Electrons per shell2, 8, 18, 8
Physical properties
Phase at STPgas
Melting point115.78 K (−157.37 °C, −251.27 °F)
Boiling point119.93 K (−153.415 °C, −244.147 °F)
Density (at STP)3.749 g/L
when liquid (at b.p.)2.413 g/cm3[3]
Triple point115.775 K, 73.53 kPa[4][5]
Critical point209.48 K, 5.525 MPa[5]
Heat of fusion1.64 kJ/mol
Heat of vaporization9.08 kJ/mol
Molar heat capacity20.95 J/(mol·K)[6]
Specific heat capacity250.006 J/(kg·K)[7]
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 59 65 74 84 99 120
Atomic properties
Oxidation statescommon: +2
ElectronegativityPauling scale: 3.00
Ionization energies
  • 1st: 1350.8 kJ/mol
  • 2nd: 2350.4 kJ/mol
  • 3rd: 3565 kJ/mol
Covalent radius116±4 pm
Van der Waals radius202 pm
Color lines in a spectral range
Spectral lines of krypton
Other properties
Natural occurrenceprimordial
Crystal structure face-centered cubic (fcc) (cF4)
Lattice constant
Face-centered cubic crystal structure for krypton
a = 583.57 pm (at triple point: 115.78 K)[8]
Thermal conductivity9.43×10−3  W/(m⋅K)
Magnetic orderingdiamagnetic[9]
Molar magnetic susceptibility−28.8×10−6 cm3/mol (298 K)[10]
Speed of sound(gas, 20 °C) 221 m·s−1
(liquid) 1120 m/s
CAS Number7439-90-9
History
Namingfrom Greek κρυπτός, 'hidden'
Discovery and first isolationWilliam Ramsay and Morris Travers (1898)
Isotopes of krypton
Main isotopes[11] Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
78Kr 0.360% 9.2×1021 y[12] εε 78Se
79Kr synth 1.46 d β+ 79Br
80Kr 2.29% stable
81Kr trace 2.3×105 y ε 81Br
81mKr synth 13.10 s IT 81Kr
ε 81Br
82Kr 11.6% stable
83Kr 11.5% stable
84Kr 57.0% stable
85Kr trace 10.728 y β 85Rb
86Kr 17.3% stable
 Category: Krypton
| references
child table, as reused in {IB-Kr}
Main isotopes of krypton
Main isotopes[11] Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
78Kr 0.360% 9.2×1021 y[12] εε 78Se
79Kr synth 1.46 d β+ 79Br
80Kr 2.29% stable
81Kr trace 2.3×105 y ε 81Br
81mKr synth 13.10 s IT 81Kr
ε 81Br
82Kr 11.6% stable
83Kr 11.5% stable
84Kr 57.0% stable
85Kr trace 10.728 y β 85Rb
86Kr 17.3% stable
Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt) caption:
alt:
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
  most stable isotope
Wikidata
Wikidata *
* Not used in {{Infobox element}} (2023-01-01)
See also {{Index of data sets}} · Cat:data sets (45) · (this table: )

References

  1. "Standard Atomic Weights: Krypton". CIAAW. 2001.
  2. Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
  3. Krypton. encyclopedia.airliquide.com
  4. "Section 4, Properties of the Elements and Inorganic Compounds; Melting, boiling, triple, and critical temperatures of the elements". CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. 2005.
  5. 1 2 Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, Florida: CRC Press. p. 4.121. ISBN 1-4398-5511-0.
  6. Shuen-Chen Hwang, Robert D. Lein, Daniel A. Morgan (2005). "Noble Gases". Kirk Othmer Encyclopedia of Chemical Technology. Wiley. pp. 343–383. doi:10.1002/0471238961.0701190508230114.a01.
  7. Shuen-Chen Hwang, Robert D. Lein, Daniel A. Morgan (2005). "Noble Gases". Kirk Othmer Encyclopedia of Chemical Technology. Wiley. pp. 343–383. doi:10.1002/0471238961.0701190508230114.a01.
  8. Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.
  9. Magnetic susceptibility of the elements and inorganic compounds, in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
  10. Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.
  11. 1 2 Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3) 030001. doi:10.1088/1674-1137/abddae.
  12. 1 2 Patrignani, C.; et al. (Particle Data Group) (2016). "Review of Particle Physics". Chinese Physics C. 40 (10) 100001. Bibcode:2016ChPhC..40j0001P. doi:10.1088/1674-1137/40/10/100001. See p. 768