Isotopes of radon

Updated on Dec 25, 2023

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There are 39 known isotopes of radon (Rn) from ¹⁹³Rn to ²³¹Rn; all are radioactive. The most stable isotope is ²²²Rn with a half-life of 3.823 days. Four isotopes, ^{218, 219, 220, 222}Rn occur in trace quantities in nature as decay products of, respectively, ²¹⁸At, ²²³Ra, ²²⁴Ra, and ²²⁶Ra. ²¹⁸Rn and ²²²Rn are intermediate steps in the decay chain for ²³⁸U, ²¹⁹Rn is an intermediate step in the decay chain for ²³⁵U and ²²⁰Rn occurs in the decay chain for ²³²Th.

Notes

Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.

Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC, which use expanded uncertainties.

References

Isotopes of radon Wikipedia

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