There are 39 isotopes and isomers of radon. The common isomers of radon are: Radon-219, Radon-220, and Radon-222. Radon-219 is known as Actinon (An) and has a half-life of 3.96 seconds. Radon-220 is known as Thoron (Tn) and has a half-life of 55.6 seconds. Radon-222, the most abundant isotope, has a half-life of 3.823 days and is the isotope that comes from the decay of radium. Each of these isotopes emits alpha particles through their decay.
The different isotopes of radon:
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