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 released from the soil and rock, where it is generated. Radon isotopes are the immediate decay products of radium isotopes. The instability of radon-222, its most stable isotope, makes radon one of the rarest elements. Radon will be present on Earth for several billion more years, despite its short half-life, because it is constantly being produced as a step in the decay chain of uranium-238, and that of thorium-232, each of which is an extremely abundant radioactive nuclide with a half-life of several billion years. The decay of radon produces many other short-lived nuclides, known as "radon daughters", ending at stable isotopes of lead. Radon-222 occurs in significant quantities as a step in the normal radioactive decay chain of uranium-238, also known as the uranium series, which slowly decays into a variety of radioactive nuclides and eventually decays into lead-206, which is stable. Radon-220 occurs in minute quantities as an intermediate step in the decay chain of thorium-232, also known as the thorium series, which eventually decays into lead-208, which is stable.

ਰੇਡਾਨ ਇੱਕ ਰਸਾਇਣਕ ਤੱਤ ਹੈ ਜਿਹਦਾ ਨਿਸ਼ਾਨ Rn ਅਤੇ ਐਟਮੀ ਸੰਖਿਆ 86 ਹੈ। ਇਹ ਵਿਕਿਰਨਕ, ਰੰਗਹੀਣ, ਗੰਧਹੀਣ, ਸੁਆਦਹੀਣ ਨੋਬਲ ਗੈਸ ਹੈ, ਜੋ ਕੁਦਰਤੀ ਤੌਰ ਉੱਤੇ ਯੂਰੇਨੀਅਮ ਜਾਂ ਥੋਰੀਅਮ ਦੇ ਅਸਿੱਧੇ ਤੌਰ ਉੱਤੇ ਗਲਣ ਨਾਲ਼ ਮਿਲਦੀ ਹੈ। ਇਹਦਾ ਸਭ ਤੋਂ ਥਿਰ ਆਈਸੋਟੋਪ ²²²Rn, ਦੀ ਅੱਧ-ਉਮਰ 3.8 ਦਿਨਾਂ ਦੀ ਹੁੰਦੀ ਹੈ। ਇਹ ਆਮ ਹਲਾਤਾਂ ਵਿੱਚ ਗੈਸ ਰਹਿਣ ਵਾਲੇ ਸਭ ਤੋਂ ਘਣੇ ਪਦਾਰਥਾਂ ਵਿੱਚੋਂ ਇੱਕ ਹੈ।