Assertion: astatine's isotope | /r/HasAspect | half-life of 8.1 hours
Facets:
Source sentences:
text: According to the Wikipedia article on astatine, the longest-lived isotope has a half-life of 8.1 hours.
text: Astatine is an extremely radioactive element; all its isotopes have half-lives of 8.1 hours or less, decaying into other astatine isotopes, bismuth, polonium, or radon.