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Radon (Rn) is a heavy noble gas with an atomic number of 86 and an atomic mass of 222. It is a radioactive substance with its isotope with its longest half-life, Radon-222, has a half-life of 3.8 days. It is located below Xenon (Xe, 54Xenon) and next to Astatine (As, 85Astatine). Radon-222 is the daughter isotope (direct decay product) of Radium-226 and decay product of Uranium-238.

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