Radon (pronounced /ˈreɪdɒn/,)is the chemical element that has the symbol Rn and atomic number 86. Radon is colorless, naturally occurring, radioactive, and a noble gas. It is formed from the decay of radium. Radon is one of the heaviest substances that is a gas under normal conditions. Radon is considered to be a health hazard also. The most stable isotope of Radon, 222Rn, has a half-life of 3.8 days and is used in radiotherapy. While having been less studied by chemists due to its radioactivity, there are a few known compounds of this generally unreactive element.Radon is a significant contaminant that affects indoor air quality worldwide. Radon gas from natural sources can accumulate in buildings and reportedly causes 21,000 lung cancer deaths per year in the United States alone.Radon is the second most frequent cause of lung cancer. Cigarette smoking is the 1st.. Radon-induced lung cancer is thought to be the 6th leading cause of cancer death overall.(wikipedia.com) |
