Assertion: protactinium's isotope | /r/HasAspect | -lives
Facets:
Source sentences:
text: All remaining radioactive isotopes have half-lives that are less than 10 hours and the majority of them have half-lives shorter than one minute.
text: Since all isotopes of neptunium have half-lives that are many times shorter than the age of the Earth, any primordial neptunium should have decayed by now.
text: All the remaining radioactive isotopes have half-lives that are less than 1.6 days, and the majority of these have half-lives that are less than 1.8 seconds.