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.

रेडॉन एक रासायनिक तत्व है, जिसका परमाणु क्रमांक 86 है। इस तत्व को Rn चिह्न के रूप में दर्शाया जाता है। यह रेडियोएक्टिव, रंगहीन, गंधहीन, स्वादहीन वाला एक आदर्श गैस है। इसका सबसे स्थायी समस्थानिक ²²²Rn है, जिसका अर्धायु काल केवल 3.8 दिन का होता है, जो इसे बहुत ही दुर्लभ तत्व बनाता है।