Radon is a radioactive, colorless, odorless, tasteless noble gas.


Radon spectrum is 400 nm - 700 nm. Credit: McZusatz.{{free media}}


Radon is, under standard conditions, gaseous and easily inhaled, and therefore a health hazard.

Radon is "one of the noble gases."[1]

The molecules Rn
and RnXe were found to be significantly stabilized by spin-orbit coupling.[2]

Radon is a colorless, odorless, and tasteless[3] gas and therefore is not detectable by human senses alone. At standard temperature and pressure, it forms a monatomic gas with a density of 9.73 kg/m3, about 8 times the density of the Earth's atmosphere at sea level, 1.217 kg/m3.[4] It is one of the densest gases at room temperature and is the densest of the noble gases.


Although colorless at standard temperature and pressure, when cooled below its freezing point of 202 K (−71 °C; −96 °F), it emits a brilliant radioluminescence that turns from yellow to orange-red as the temperature lowers.[5] Upon condensation, it glows because of the intense radiation it produces.[6] It is sparingly soluble in water, but more soluble than lighter noble gases. It is appreciably more soluble in organic liquids than in water. Its solubility equation is as follows,[7][8][9]


where   is the molar fraction of Radon,   is the absolute temperature, and   and   are solvent constants.


Radon carbonyl (RnCO) has been predicted to be stable and to have a linear molecular geometry.[10]


See alsoEdit


  1. radon. San Francisco, California: Wikimedia Foundation, Inc. 27 September 2013. Retrieved 5 October 2013. 
  2. Runeberg, Nino; Pyykkö, Pekka (1998). "Relativistic pseudopotential calculations on Xe2, RnXe, and Rn2: The van der Waals properties of radon". International Journal of Quantum Chemistry 66 (2): 131. doi:10.1002/(SICI)1097-461X(1998)66:2<131::AID-QUA4>3.0.CO;2-W. 
  3. "A Citizen's Guide to Radon: The Guide to Protecting Yourself and Your Family from Radon". 2016.
  4. Williams, David R. (2007-04-19). "Earth Fact Sheet". NASA. Retrieved 2008-06-26.
  5. "Radon". Jefferson Lab. Retrieved 2008-06-26.
  6. Thomas, Jens (2002). Noble Gases. Marshall Cavendish. p. 13. 
  7. Gerrard, W (1979). Solubility Data Series (Vol.2 ed.). Pergamon Press. pp. 264–271. 
  8. Battino, R (1979). Solubility Data Series (Vol.2 ed.). Pergamon Press. pp. 227–234. 
  9. Saito, M (1999). "Determination of Radon Solubilities to 1,2-Dimethylbenzene, 1,3- Dimethylbenzene, 1,4-Dime thylbenzene, 1,3,5-Trimethylbenzene, 1, 2,4-Trimethylbenzene and 1-Isopropyl-4-methylbenzene". Nippon Kagaku Kaishi (6): 363–368. doi:10.1246/nikkashi.1999.363. 
  10. Malli, Gulzari L. (2002). "Prediction of the existence of radon carbonyl: RnCO". International Journal of Quantum Chemistry 90 (2): 611. doi:10.1002/qua.963. 

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