Assertion: antimony's isotope | /r/HasProperty | known in nature
Facets:
Source sentences:
text: In nature, two stable isotopes are known: 121Sb (57.25 percent) and 123Sb (42.75 percent).
text: In nature, two stable isotopes are known: 121Sb (57.25 percent) and 123Sb (42.75 percent).