Assertion: erbium's isotope | /r/HasProperty | amu
Facets:
Source sentences:
text: The isotopes of erbium range in atomic weight from 142.96634 amu (143Er) to 176.95405 amu (177Er).
text: The isotopes of erbium range in atomic weight from 142.96634 amu (143Er) to 176.95405 amu (177Er).