Relative atomic mass: [222]

English: Radon
French: Radon
Croatian: Radon
German: Radon
Italian: Radon
Spanish: Radon

Atomic number: 86
Group numbers: 18
Period: 6
Standard state (20 oC): gas

Discovery: 1899 Robert Bowie Owens, Ernest Rutherford (GB)
Radon was discovered by Robert Bowie Owens and Ernest Rutherford (GB) in 1899. The origin of the name is variation of the name of element radium; radon was called niton at first, from the Latin word nitens meaning shining. It is a colourless, odourless radioactive, heavy, noble gas that is chemically inert and non-flammable but is highly radiotoxic and carcinogen by inhalation. Radon is formed from the decay of radium in the earths crust. It is used to treat some forms of cancer.
Electronic configuration: [Xe] 4f14 5d10 6s2 6p6
Formal oxidation number: 0
Atomic radius: 240 pm

Electronegativities: -
Thermal conductivity: 0.0036 W/(m K)
Electrical resistivity (20 oC): - microOhm cm

Melting point: -71 oC
Boiling point: -61.7 oC

Heat of fusion: 2.7 kJ/mol
Heat of vaporization: 18.1 kJ/mol
Heat of atomization: 0 kJ/mol

85At <= 86Rn => 87Fr

ASCII Periodic Table of the Elements
6 Jan. 2020
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