Yes, it has three.
Radon-222 is the most harmful isotope of radon. It is radioactive and decays into other radioactive elements called radon progeny, which can attach to dust particles and be inhaled, increasing the risk of lung cancer.
Radon has 86 electrons and protons; the number of neutrons is specific for each isotope. Number of neutrons in a radon isotope = Mass number - 86
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Radon has 86 protons and electrons; the number of neutrons is different for each isotope: Number of neutrons = Atomic mass of the Rn isotope - 86
An actinon is a radioactive isotope of an actinide, sometimes used exclusively for an isotope of radon.
Radon.
Radon has atomic mass of 222. There is isotope of Radon with mass number 226. Radon is a Nobel gas.
Radon has 34 isotopes; each isotope has a different atomic mass. See the link.
222 Amu (atomic mass units) Each isotope of radon has a different atomic mass; see the link. The density of radon is 9,73 g/L.
Although the atomic mass number of radon is often given as 220, there are 39 isotopes and isomers of radon. The common isomers of radon are : radon-219, radon-220, and radon-222.
210 total combined
The isotope with 86 protons and 136 neutrons is radium-222.