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Rn
Radon
Atomic no.:
86
Atom. weight: 222
Density: 0.00973
Class:
noble gas
Melting point: -71°C
Boiling point: -61.8°C
Colour: colourless
   
Discoverer: Friedrich Ernst Dorn
Place: Germany
Year: 1900

Radon is the chemical element that has the symbol Rn and atomic number 86. Radon is a colorless, naturally occurring, radioactive noble gas that is formed from the decay of radium. It is one of the heaviest substances that are gases under normal conditions and is considered to be a health hazard. The most stable isotope, 222Rn, has a half-life of 3.8 days and is used in radiotherapy. Although due to its radioactivity, it has been less studied by chemists, there are a few known compounds of this unreactive element. Radon is a significant contaminant that affects indoor air quality worldwide. Radon gas from natural sources can accumulate in buildings and reportedly causes 21,000 lung cancer deaths per year in the United States alone. Radon is the second most frequent cause of lung cancer, after cigarette smoking, and radon-induced lung cancer is thought to be the 6th leading cause of cancer death overall.

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