Assertion: actinium'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: 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: All isotopes of radium have half-lives much shorter than the age of the Earth, so that any primordial radium would have decayed long ago.