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Radon,  86Rn
A smaa gowd tube filled wi radon gas, causin radioluminescence o the phosphor layer ablo
General properties
Name, seembol radon, Rn
Pronunciation /ˈrdɒn/ RAY-don
Appearance colorless gas
Radon in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Iron (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Copper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Silver (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercury (transeetion metal)
Thallium (post-transeetion metal)
Lead (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)


Atomic nummer 86
Staundart atomic wicht (Ar) (222)
Element category   noble gas
Group, block group 18 (noble gases), p-block
Period period 6
Electron configuration [Xe] 4f14 5d10 6s2 6p6
per shell
2, 8, 18, 32, 18, 8
Pheesical properties
Phase gas
Meltin pynt 202 K ​(−71 °C, ​−96 °F)
Boilin pynt 211.5 K ​(−61.7 °C, ​−79.1 °F)
Density at stp (0 °C an 101.325 kPa) 9.73 g/L
when 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 18.10 kJ/mol
Molar heat capacity 5R/2 = 20.786 J/(mol·K)
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 Pauling scale: 2.2
Covalent radius 150 pm
Van der Waals radius 220 pm
Crystal structur face-centered cubic (fcc)
Face-centered cubic crystal structure for radon
Thermal conductivity 3.61 m W/(m·K)
Magnetic orderin non-magnetic
CAS Registry Nummer 10043-92-2
Discovery Friedrich Ernst Dorn (1898)
First isolation William Ramsay an Robert Whytlaw-Gray (1910)
Maist 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
· references

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.