Assertion: erbium's isotope | /r/HasProperty | recognized
Facets:
value: so far
type: OTHER
Source sentences:
text: 29 radioactive isotopes are also recognized.
text: So far, nine radioactive isotopes of erbium have been identified.
text: Nine radioactive isotopes of erbium are also recognized.
text: Nine radioactive isotopes of erbium are also recognized.