Isotopes of astatine

Isotopes of astatine (₈₅At)
α	205Bi
α	206Bi
α	207Bi
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Astatine (₈₅At) has 41 known isotopes, all of which are radioactive; their mass numbers range from 188 to 229 (though ¹⁸⁹At is undiscovered).^[2] There are also 24 known metastable excited states. The longest-lived isotope is ²¹⁰At, which has a half-life of 8.1 hours; the longest-lived isotope existing in naturally occurring decay chains is ²¹⁹At with a half-life of 56 seconds.

^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
^ Cite error: The named reference At188190 was invoked but never defined (see the help page).

[NUBASE2020-1] Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

[At188190-2] Cite error: The named reference At188190 was invoked but never defined (see the help page).

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