After smoking, radon is the 2nd most frequent cause of lung cancer with over 21,000 lung cancer deaths per year in the US alone. There is a clear link between breathing high concentrations of radon and incidence of lung cancer.Thus, radon is considered a significant contaminant to indoor air quality. This is especially true in lower levels such as basements due to the heaviness of the gas. Radon gas and its decay particles can reach very high concentrations inside buildings.As radon decays, it produces more radioactive elements called radon daughters or decay products. The naturally occurring decay of the two most common radioactive elements uranium and thorium, produces radium.In 1908, William Ramsay and Robert Whytlaw Gray isolated radon and figured out its density. In 1900, German physicist Friedrich Ernst Dorn discovered radon when he found that radium compounds emit a radioactive gas which he called Radium Emanation.Therefore very few radon compounds have been found. The radioactive health risk of radon and the fact it costs a lot has made it hard for experimental chemical research to be performed.Under normal conditions radon is one of the densest and is the heaviest of known gases.Radon has a melting point of -95 ☏ (-71 ☌) and a boiling point of -79 ☏ (-61.7 ☌).When radon is cooled below its freezing point of -96 ☏ (-71 ☌) it emits a bright radiating luminescence that starts out yellow and as the temperature lowers becomes a orangey red color. ![]() Radon is a radioactive noble gas, it is colorless, odorless and tasteless.Radon is a chemical element, its symbol is Rn and it has an atomic number of 86.
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