Radon

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 the anly gas unner normal condeetions that anly haes radioactive isotopes, an is considered a heal hazard due tae its radioactivity an aa. Intense radioactivity haes an aa hindered chemical studies o radon an anly a few compoonds are kent.

Radon, ₈₆Rn

Radon
Pronunciation	/ˈreɪdɒn/ ​(RAY-don)
Appearance	colourless gas
Mass number	[222]
Radon in the periodic cairt
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium Xe ↑ Rn ↓ Uuo astatine ← radon → francium
Atomic nummer (Z)	86
Group	group 18 (noble gases)
Period	period 6
Block	p-block
Element category	Noble gas
Electron confeeguration	[Xe] 4f14 5d10 6s2 6p6
Electrons per shell	2, 8, 18, 32, 18, 8
Pheesical properties
Phase at STP	gas
Meltin pynt	202 K ​(−71 °C, ​−96 °F)
Bylin pynt	211.5 K ​(−61.7 °C, ​−79.1 °F)
Density (at STP)	9.73 g/L
whan liquid (at b.p.)	4.4 g/cm3
Creetical pynt	377 K, 6.28[1] MPa
Heat o fusion	3.247 kJ/mol
Heat o vapourisation	18.10 kJ/mol
Molar heat capacity	5R/2 = 20.786 J/(mol·K)
Vapour pressur P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 110 121 134 152 176 211
Atomic properties
Oxidation states	0, +2, +6
Electronegativity	Pauling scale: 2.2
Covalent radius	150 pm
Van der Waals radius	220 pm
Colour lines in a spectral range Spectral lines o radon
Ither properties
Creestal structur	​face-centred cubic (fcc)
Thermal conductivity	3.61 m W/(m·K)
Magnetic orderin	non-magnetic
CAS Nummer	10043-92-2
History
Diskivery	Friedrich Ernst Dorn (1898)
First isolation	William Ramsay an Robert Whytlaw-Gray (1910)
Main isotopes o radon
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct 210Rn syn 2.4 h α 206Po 211Rn syn 14.6 h ε 211At α 207Po 222Rn trace 3.8235 d α 218Po 224Rn syn 1.8 h β− 224Fr
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References

1. Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nt ed.). CRC Press. p. 4.122. ISBN 1439855110.
2. "A Citizen's Guide to Radon | Radon | US EPA". Epa.gov. 5 August 2010. Retrieved 28 Apryle 2012.