Radon Elemental Symbol
Radon



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Radon Radon Radon Rádon Rádon Radon

Radon Bohr ModelRadon is a Block P, Group 18, Period 6 element. The number of electrons in each of Radon's shells is 2, 8, 18, 32, 18, 8 and its electronic configuration is [Xe] 4f14 5d106s26p6. In its elemental form radon's CAS number is 10043-92-2. The radon atom has a covalent radius of 150.pm and it's Van der Waals radius is 220.pm. Radon is produced by the radioactive decay of radium-226, which is found in phosphate, igneous and metamorphic rocks as well as uranium ores and shales. Radon was discovered by Friedrich Ernst Dorn (Germany) in 1898. It was first isolated by William Ramsay and Robert Whytlaw-Gray in 1910. The name radon is derived from the element radium. At first radon was called niton, from the Latin word ‘Nitens’ which means shining.

Radon is highly radioactive and a carcinogen. Radon 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
  • Research
  • Isotopes
  • Other Elements

Radon Properties


GENERAL PROPERTIES   PHYSICAL PROPERTIES  
Symbol: Rn Melting Point: -71 oC, -95.8 oF, 202.15 K
Atomic Number: 86 Boiling Point: -61.7 oC, -79.06 oF, 211.45 K
Atomic Weight: 222 Density: 440 (liquid 211 K) kg m-3
Element Category: noble gases Liquid Density @ Melting Point: 4.4 g·cm−3
Group, Period, Block: 18, 6, p Specific Heat: N/A
    Heat of Vaporization 18.1 kJ mol-1
CHEMICAL STRUCTURE Heat of Fusion 2.7 kJ mol-1
Electrons: 86 Thermal Conductivity: 3.61 m W·m−1·K−1
Protons: 86 Thermal Expansion: N/A
Neutrons: 136 Electrical Resistivity: N/A
Electron Configuration: [Xe]6s24f145d106p6 Electronegativity: 2.2 (Pauling scale)
Atomic Radius: N/A Tensile Strength: N/A
Covalent Radius: 150 pm Molar Heat Capacity: 5R/2 = 20.786 J·mol−1·K−1
Van der Waals radius: 220 pm Young's Modulus: N/A
Oxidation States: 6, 2, 0 Shear Modulus: N/A
Phase: Gas Bulk Modulus: N/A
Crystal Structure: face-centered cubic Poisson Ratio: N/A
Magnetic Ordering: non-magnetic Mohs Hardness: N/A
1st Ionization Energy: 1037.08 kJ mol-1 Vickers Hardness: N/A
2nd Ionization Energy: N/A Brinell Hardness: N/A
3rd Ionization Energy: N/A Speed of Sound: N/A
       
IDENTIFIERS   MISCELLANEOUS  
CAS Number: 10043-92-2 Abundance in typical human body, by weight: N/A
ChemSpider ID: 23240 Abundance in typical human body, by atom: N/A
PubChem CID: 24857 Abundance in universe, by weight: N/A
MDL Number: N/A Abundance in universe, by atom: N/A
EC Number: N/A Discovered By: Friedrich Ernst Dorn
Beilstein Number: N/A Discovery Date: 1898
SMILES Identifier: [Rn]  
InChI Identifier: InChI=1S/Rn Other Names: Rádon
InChI Key: SYUHGPGVQRZVTB-UHFFFAOYSA-N  
       
       
       
       
       


Recent Research & Development for Radon

  • The cellular and molecular carcinogenic effects of radon exposure: a review. Robertson A, Allen J, Laney R, Curnow A. Int J Mol Sci. 2013 Jul 5;14(7):14024-63. doi: 10.3390/ijms140714024.
  • THE MEASUREMENT ACCURACY OF PASSIVE RADON INSTRUMENTS. Beck TR, Foerster E, Buchröder H, Schmidt V, Döring J. Radiat Prot Dosimetry. 2013 Jul 21. [Epub ahead of print]
  • Lung Cancer Efforts Need Stronger Emphasis on Reducing Radon Exposure. Conrath SM, Pawel DJ. Am J Public Health. 2013 Jul 18. [Epub ahead of print]
  • Long-term benefits of radon spa therapy in rheumatic diseases: results of the randomised, multi-centre IMuRa trial. Annegret F, Thomas F. Rheumatol Int. 2013 Jul 18. [Epub ahead of print]
  • Synergistic effect of radon in blood cells of smokers - An in vitro study. Meenakshi C, Mohankumar MN. Mutat Res. 2013 Jul 9. doi:pii: S1383-5718(13)00168-X. 10.1016/j.mrgentox.2013.06.018. [Epub ahead of print]
  • PILOT SURVEY OF INDOOR RADON IN THE DWELLINGS OF BULGARIA. Ivanova K, Stojanovska Z, Badulin V, Kunovska B. Radiat Prot Dosimetry. 2013 Jul 11. [Epub ahead of print]
  • [Estimation of effective doses derived from radon in selected SPA centers that use geothermal waters based on the information of radon concentrations]. Walczak K, Zmyslony M. Med Pr. 2013;64(2):193-8. Polish.
  • A comparison of two methods for ecologic classification of radon exposure in british columbia: residential observations and the radon potential map of Canada. Rauch SA, Henderson SB. Can J Public Health. 2013 Mar 6;104(3):e240-5.
  • Nonlinear radon transform using zernike moment for shape analysis. Ma Z, Kang B, Lv K, Zhao M. Comput Math Methods Med. 2013;2013:208402. doi: 10.1155/2013/208402. Epub 2013 Apr 21.
  • Determination of mechanisms and parameters which affect radon entry into a room. Vasilyev AV, Zhukovsky MV. J Environ Radioact. 2013 Jun 26;124C:185-190. doi: 10.1016/j.jenvrad.2013.04.014. [Epub ahead of print]
  • Improved blood velocity measurements with a hybrid image filtering and iterative Radon transform algorithm. Chhatbar PY, Kara P. Front Neurosci. 2013 Jun 18;7:106. doi: 10.3389/fnins.2013.00106. Print 2013.
  • Mapping radon-prone areas using ?-radiation dose rate and geological information. García-Talavera M, García-Pérez A, Rey C, Ramos L. J Radiol Prot. 2013 Jun 27;33(3):605-620. [Epub ahead of print]
  • DIURNAL VARIATIONS OF RADON AND THORON ACTIVITY CONCENTRATIONS AND EFFECTIVE DOSES IN DWELLINGS IN NISKA BANJA, SERBIA. Vaupotic J, Streil T, Tokonami S, Zunic ZS. Radiat Prot Dosimetry. 2013 Jun 25. [Epub ahead of print]
  • COMPARISON OF ACTIVE AND PASSIVE METHODS FOR RADON EXHALATION FROM A HIGH-EXPOSURE BUILDING MATERIAL. Abbasi A, Mirekhtiary F. Radiat Prot Dosimetry. 2013 Jun 23. [Epub ahead of print]
  • MEASUREMENT OF INDOOR AND OUTDOOR RADON CONCENTRATIONS DURING SUPERSTORM SANDY. Kotrappa P, Paul P, Stieff A, Stieff F. Radiat Prot Dosimetry. 2013 Jun 23. [Epub ahead of print]
  • The cost effectiveness of radon reduction programmes in domestic housing in England and Wales: The impact of improved radon mapping and housing trends. Denman AR, Sinclair J, Phillips PS, Crockett RG, Groves-Kirkby CJ. Environ Int. 2013 Jun 18;59C:73-85. doi: 10.1016/j.envint.2013.05.012. [Epub ahead of print]
  • RADON REMEDIATION AND PREVENTION STATUS IN 23 EUROPEAN COUNTRIES. Holmgren O, Arvela H, Collignan B, Jiránek M, Ringer W. Radiat Prot Dosimetry. 2013 Jun 14. [Epub ahead of print]
  • Absorbed doses of lungs from radon retained in airway lumens of mice and rats. Sakoda A, Ishimori Y, Yamaoka K, Kataoka T, Mitsunobu F. Radiat Environ Biophys. 2013 Aug;52(3):389-95. doi: 10.1007/s00411-013-0478-5. Epub 2013 Jun 15.
  • WHO Handbook on Indoor Radon: A Public Health Perspective. Geneva: World Health Organization; 2009.
  • [Indoor radon. A neglected carcinogen at work.] Ruano-Ravina A, Barros-Dios JM. Arch Prev Riesgos Labor. 2013 Jan to Mar;16(1):5-6. Spanish. No abstract available.

Radon Isotopes


Radon has 39 known isotopes. Four of them, 218Rn, 219Rn, 220Rn and 222Rn, occur in trace quantities in nature.

Nuclide Symbol Isotopic Mass Half-Life Nuclear Spin
218Rn 218.0056013 35 milliseconds 0+
219Rn 219.0094802 3.96 seconds 5/2+
220Rn 220.0113940 55.6 seconds 0+
222Rn 222.0175777 3.8235 days 0+