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colorless gas
A smaa gowd tube filled wi radon gas, causin radioluminescence o the phosphor layer ablo
General properties
Name, seembol, nummer radon, Rn, 86
Pronunciation /ˈrdɒn/ RAY-don
Element category noble gases
Group, period, block 18 (noble gases), 6, p
Staundart atomic wicht (222)
Electron confeeguration [Xe] 4f14 5d10 6s2 6p6
2, 8, 18, 32, 18, 8
Electron shells of radon (2, 8, 18, 32, 18, 8)
Discovery Friedrich Ernst Dorn (1898)
First isolation William Ramsay an Robert Whytlaw-Gray (1910)
Physical properties
Phase gas
Density (0 °C, 101.325 kPa)
9.73 g/L
Liquid density at b.p. 4.4 g·cm−3
Meltin pynt 202 K, −71 °C, −96 °F
Boilin pynt 211.5 K, −61.7 °C, −79.1 °F
Creetical pynt 377 K, 6.28[1] MPa
Heat o fusion 3.247 kJ·mol−1
Heat o vaporization 18.10 kJ·mol−1
Molar heat capacity 5R/2 = 20.786 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 110 121 134 152 176 211
Atomic properties
Oxidation states 6, 2, 0
Electronegativity 2.2 (Pauling scale)
Ionization energies 1st: 1037 kJ·mol−1
Covalent radius 150 pm
Van der Waals radius 220 pm
Crystal structure face-centered cubic
Radon has a face-centered cubic crystal structure
Magnetic orderin non-magnetic
Thermal conductivity 3.61 m W·m−1·K−1
CAS registry nummer 10043-92-2
Most stable isotopes
Main article: Isotopes o radon
iso NA hauf-life DM DE (MeV) DP
210Rn syn 2.4 h α 6.404 206Po
211Rn syn 14.6 h ε 2.892 211At
α 5.965 207Po
222Rn trace 3.8235 d α 5.590 218Po
224Rn syn 1.8 h β 0.8 224Fr
· r

Radon is a chemical element wi seembol Rn an atomic nummer 86. It is a radioactive, colourless, odorless, tasteless[2] noble gas, occurrin naiturally as an indirect decay product o uranium or thorium. Its maist stable isotope, 222Rn, haes a hauf-life o 3.8 days. Radon is ane o the densest substances that remains a gas unner normal condeetions. It is an aa the anly gas unner normal condeetions that anly haes radioactive isotopes, an is considered a heal hazard due tae its radioactivity. Intense radioactivity haes an aa hindered chemical studies o radon an anly a few compoonds are kent.

References[eedit | eedit soorce]

  1. Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). CRC Press. p. 4.122. ISBN 1439855110. 
  2. "A Citizen's Guide to Radon | Radon | US EPA". Epa.gov. 2010-08-05. Retrieved 2012-04-28.