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RADON: The Radioactive Noble Gas

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It was first discovered by Frendrich E. Dorn from Germany in 1900 while working with the element radium. Later in 1908, Robert Gray and William Ramsay isolated the gas which was named as niton. The gas has been called as radon by IUPAC (International Union for Pure and Applied Chemistry) since 1923.

Melting And Boiling Point

Melting point: -71°c or 202k.

Boiling point: -61.7°c or 211.3k.


Radon decays into radioactive polonium and alpha particles. This emitted radiation made radon useful in cancer therapy.

It was used in some hospitals to treat tumour by sealing the gas in minute tubes, and implanting these into the tumour, treating the disease in situ.

It is used to predict earthquakes, in the study of atmospheric transport, and in exploration for petroleum.


It is a naturally occurring radioactive gas and comes from the natural breakdown (radioactive decay) of uranium. It is usually found in igneous rocks and soil, but in some cases, well water may also be a source of radon.


It is colourless at standard temperature and pressure and it is the most dense gas known. At temperature below it's freezing point, it has a brilliant yellow phosphorescence. It is chemically unreactive, it is highly radioactive and has a short half life.





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Source: opera.com
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