Assertion: polonium | /r/HasAspect | 33 known isotopes
Facets:
Source sentences:
text: Polonium have 33 known isotopes.
text: Polonium has 33 known isotopes, all of which are radioactive.
text: Polonium has 33 known isotopes, all of which are radioactive.
text: Polonium has 33 known isotopes, all of which are radioactive.