Radon: the essentials

At ordinary temperatures radon is a colourless gas. When cooled below the freezing point, radon exhibits a brilliant phosphorescence which becomes yellow as the temperature is lowered and orange-red at the temperature of liquid air. The main hazard is from inhalation of the element and its decay products which are collected on dust in the air. Recently, radon buildup in homes from the surrounding soil and rocks has become a safety issue and some areas around the world test homes for radon gas. It is the heaviest known gas. Radon is present in some spring waters.

Table: basic information about and classifications of radon.

Radon: historical information

Radon was discovered by Friedrich Ernst Dorn at 1900 in Germany. Origin of name: named after "the element radium" (radon was called niton at first, from the Latin word "nitens" meaning "shining".

Radon was discovered in 1900 by Friedrich Ernst Dorn, who called it niton. It is essentially inert. It has been called radon since 1923, before which it was called niton.

Radon: physical properties

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Radon: orbital properties

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Isolation

Isolation: radon is present to a very small trace extent in the atmosphere and in principle could be obtained as a byproduct from the liquefaction and separation of air. However as only small quantities are ever needed in practice, and because of its short half life (the longest life isotope has a half life of less than 4 days), such quantities as are required are isolated through collection from the radioactive decay of an isotope of radium (226Ra, half life 1599 years).

226Ra → 222Rn + 4He

This method gives 0.64 cm3 of radon gas per gram of radium per month.

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radon atomic number