Radon
Chemical element
Radon is a chemical element; it has symbol Rn and atomic number 86. It is a radioactive noble gas and is colorless and odorless. Of the three naturally occurring radon isotopes, only radon-222 has a sufficiently long half-life for it to be... Wikipedia
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Radon is a radioactive gas that cannot be seen, smelled or tasted. Radon gas is a natural substance that can be found in the dirt and rocks beneath houses, ...