Assertion: rutherfordium | /r/HasAspect | 15 isotopes
Facets:
value: with mass numbers
type: OTHER
Source sentences:
text: Isotopes: Rutherfordium has 15 isotopes whose half-lives are known, with mass numbers from 253 to 268.
text: Rutherfordium has 15 isotopes with mass numbers ranging from 253Rf to 268Rf.