This page provides supplementary data about the noble gases, which were excluded from the main article to conserve space and preserve focus. Oganesson is mostly not included due to the limited amount of known data.

Physical properties

Solid

Physical propertyHeliumNeonArgonKryptonXenonRadon
Density, solid at triple point (g/dm³)[1]–1444162328263540–
Crystal structure[2]hcpfccfccfccfccfcc

Liquid

Physical propertyHeliumNeonArgonKryptonXenonRadon
Density, liquid at boiling point and 1 atm (g/dm³)[1]125.012071393.9241530574400
Density, liquid at triple point (g/dm³)[1]–1247141524513084–
Thermal conductivity, liquid at boiling point (mW m−1 K−1)[1]31.4129.7121.388.373.2–
Dielectric constant (liquid)[3][4]1.057[5][6]1.191[7][8]1.325 [9]1.664[10]1.880[11]—

Gas

Physical propertyHeliumNeonArgonKryptonXenonRadon
Density, gas at 0 °C and 1 atm (g/dm³)[2]0.17860.90021.78183.7085.8519.97
Thermal conductivity at 0 °C (J s−1 m−1 K−1)[12]0.14180.04610.01690.008740.005060.0036[13]
Mean free path at STP (nm)[2]192.66135.3668.3352.3437.88 –
Solubility in water at 20 °C (cm3/kg) [12]8.6110.533.659.4108.1230
Magnetic susceptibility (cgs units per mole)[2]−0.0000019−0.0000072−0.0000194−0.000028−0.000043–
Heat capacity, Cp, gas at 1 atm (J mol−1 K−1)[1]20.7820.7920.8520.9521.0121
Sonic velocity at 0 °C and 1 atm (m/s)[1]973433307.8213168–
Thermal conductivity, gas at 0 °C and 1 atm (mW m−1 K−1)[1]141.8446.0716.948.745.063.6[13]
Molar refraction (D line, cm3)[14]0.5211.0044.2036.39710.435–
Dielectric constant (gas)[15]1.0000684[16]1.00013[17]1.000516[18]–––
van der Waals constant a (L2bar/mol2)[15]0.034120.21071.3452.3184.194–
van der Waals constant b (L/mol)[15]0.023700.017090.032190.039780.05105–

Phase changes and critical properties

Physical propertyHeliumNeonArgonKryptonXenonRadon
Boiling point (°C)[2]−268.8−245.9−185.8−151.7−106.6−61.7
Boiling point (K)4.1527.1587.15121.2165.2211.3
Melting point (°C)[2]−272−248.5−189.6−157.4−111.5−71.0
Melting point (K)1.1524.6583.55115.75161.65202.15
Critical temperature (K)[2]5.2544.5150.85209.35289.74378.15
Critical pressure (atm)[2]2.2626.948.354.357.6462
Critical density (g/mL)[2]0.06930.4840.5360.9081.100–
Triple point temperature (K)[1]2.19[19]24.56283.80115.76161.37202
Triple point pressure (kPa)[1]5.1[19]43.3768.9073.1581.6670

Atomic properties

Atomic propertyHeliumNeonArgonKryptonXenonRadonOganesson
Atomic number[12]21018365486118
Standard atomic weight[12]4.002602(2)20.1797(6)39.948(1)83.80(1)131.29(2)(222)(294)
Number of natural isotopes[12]2336940
Outer shell electron configuration[12]1s22s22p63s23p64s24p65s25p66s26p67s27p6
Atomic radius (pm)[2]31387188108120138
Ionization energy (kJ/mol)[12]237220801520135111701037839
Static polarizability[2] (Å3)0.2040.3921.632.4654.01––
Average Valence Electron Energy (AVEE)4.164.793.242.972.582.60–

Abundance

AbundanceHeliumNeonArgonKryptonXenonRadonOganesson
Solar System (for each atom of silicon)[20]23432.1480.10255.515 × 10−55.391 × 10−6––
Earth's atmosphere (volume fraction in ppm)[21]5.2018.209340.001.100.09(0.06–18) × 10−190
Igneous rock (mass fraction in ppm)[12]3 × 10−37 × 10−54 × 10−2––1.7 × 10−100

Economic data

Gas2004 price (USD/m3)[1]
Helium (industrial grade)4.20–4.90
Helium (laboratory grade)22.300–44.90
Argon2.70–8.50
Neon60–120
Krypton400–500
Xenon4000–5000

Radon is available only in very small quantities, and due to its short half-life, is generally produced by a radium-226 source in secular equilibrium.[22] Oganesson is almost impossible to produce and with a very short half-life, it is not readily available for purchase.

References and notes

  1. ^ 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. ISBN 978-0471238966.
  2. ^ "Noble Gas". Encyclopædia Britannica. 2008.
  3. ^ Amey, R. L. (1964). "Dielectric Constants of Liquefied Noble Gases and Methane". Journal of Chemical Physics. 40 (1): 146–148. Bibcode:1964JChPh..40..146A. doi:10.1063/1.1724850
  4. ^ CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data.. 2016-2017, 97th ed. Boca Raton, Florida. 2016-06-22. ISBN 978-1-4987-5429-3. OCLC 957751024
  5. ^ at 1.5–2.5 K
  6. ^ Chase, C.E.; Maxwell, E.; Millett, W.E. (December 1961). "The dielectric constant of liquid helium". Physica. 27 (12): 1129–1145. Bibcode:1961Phy....27.1129C. doi:10.1016/0031-8914(61)90054-4
  7. ^ at 26.11 K
  8. ^ "Dielectric Constant | The Elements Handbook at KnowledgeDoor". KnowledgeDoor. Retrieved 2019-12-17.
  9. ^ at 140 K
  10. ^ at 119.80K
  11. ^ at 161K
  12. ^
  13. ^ Generalic, Eni,"Radon," EniG. Periodic Table of the Elements. 27 May 2013. KTF-Split. (accessed 30 May 2013).
  14. ^ Peter Häussinger; Reinhard Glatthaar; Wilhelm Rhode; Helmut Kick; Christian Benkmann; Josef Weber; Hans-Jörg Wunschel; Viktor Stenke; Edith Leicht; Hermann Stenger (2002). "Noble gases". Ullmann's Encyclopedia of Industrial Chemistry. Wiley. doi:10.1002/14356007.a17_485. ISBN 978-3527306732.
  15. ^ Lide, D. R. (Ed.) (1990). CRC Handbook of Chemistry and Physics (70th Edn.). Boca Raton (FL):CRC Press.
  16. ^ <3 × 106 Hz at 140 °C
  17. ^ 106 Hz at 0°C
  18. ^ 1015 Hz at 20°C
  19. ^ Lambda point for pure 4He from Yunus A. Cengel, Robert H. Turner. Fundamentals of thermal-fluid sciences. McGraw-Hill, 2004, p. 78. ISBN 0-07-297675-6
  20. ^ Lodders, Katharina (July 10, 2003). "Solar System Abundances and Condensation Temperatures of the Elements". The Astrophysical Journal. 591 (2): 1220–1247. Bibcode:2003ApJ...591.1220L. doi:10.1086/375492. S2CID 42498829. Archived from the original on November 7, 2015. Retrieved September 2, 2015.
  21. ^ "The Atmosphere". National Weather Service. Retrieved 2008-06-01.
  22. ^ Collé, R & Kishore, Raj (1997-06-11). "An update on the NIST radon-in-water standard generator: its performance efficacy and long-term stability". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 391 (3): 511–528. Bibcode:1997NIMPA.391..511C. doi:10.1016/S0168-9002(97)00572-X