222 86 rn

Radon is a chemical element; it has symbol Rn and atomic number 86. 86 gt It is a radioactive noble gas and is colorless and odorless. 86 coffee cempaka putih Of the three naturally occurring radon isotopes, only radon-222 has a sufficiently long half-life (3 825 days) for it to be released from the soil and rock, where it is generated [3]