Assertion: actinium | /r/HasAspect | stable isotopes
Facets:
Source sentences:
text: Actinium has no stable isotopes.
text: Actinium ( 89 Ac) has no stable isotopes and no characteristic terrestrial isotopic composition, thus a standard atomic weight cannot be given.
text: Actinium ( 89 Ac) has no stable isotopes and no characteristic terrestrial isotopic composition, thus a standard atomic weight cannot be given.