Radon, atomic number 86, was discovered as radon gas in 1900 by Fredrich E. Dorn in Halle, Germany. He called it radium emanation as the gas came from the element radium, which he was working with. Sir William Ramsay and Robert Gray isolated the gas and named it niton in the year 1908. The element has been called radon since 1923. This name is in honour of radium, which is one of its sources. Radon is one of the earliest discovered radioactive elements. It was identified after uranium, thorium, polonium and radium.
Radon is highly radioactive and causes cancer.
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