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Radon is a noble gas. It is not to be confused with radium, an alkali earth metal. The atomic weight of Radon-222, the most common isotope, is 222.0175777.

Radon is a radioactive gas which comes from the natural decay of uranium in the ground. The EPA claims that it is a health hazard and causes cancer in people and animals exposed to it, though many conservative commentators and some industrial hygienists[1] state that the dangers are significantly exaggerated.


  1. Connell, C.P. Radon: Truth vs. myth; Forensic Applications Consulting Technologies, Inc. [1]