This site offers comprehensive information for each element including: who, when up to 40 properties (chemical & physical); over 3, 600 nuclides (isotopes); over 4, 400 nuclide decay modes; the element names in 10 different languages; and more. In addition chemistry and technical terms are linked to their definitions in the site's chemistry and environmental dictionary.

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The Element Radon - Basic Physical and Historical Information ...

Discovered : by F.E. Dorn Isolated in Halle, Germany Origin : The name is derived from radium. Description : Radon was first discovered as the gas produced from radium as it decayed in sealed ampoules. It is colourless and odourless, and is chemically inert, but it is dangerous because it gives off alpha rays. There is a detectable amount in the atmosphere, and concentrations can build up ...