Assertion: polonium's isotope | /r/HasProperty | stable
Facets:
Source sentences:
text: The element polonium has no stable isotopes, and the isotope with mass number 209 has the longest half life of 103 years.
text: Polonium has no stable isotopes and has over 50 potential isotopes.
text: Polonium has no stable isotopes and has over 50 potential isotopes.