Assertion: occurring erbium | /r/HasProperty | a mixture of six isotopes
Facets:
Source sentences:
text: Naturally occurring erbium is a mixture of six isotopes and they are found in the percentages shown: 162Er (0.1%), 164Er (1.6%), 166Er (33.6%), 167Er (22.9%), 168Er (26.8%) and 170Er (14.9%).
text: Naturally occurring erbium is a mixture of six isotopes, all of which are stable.
text: Naturally occurring erbium is a mixture of six isotopes, all of which are stable.