Assertion: polonium | /r/AtLocation | two metallic allotropes
Facets:
Source sentences:
text: Polonium is a radioactive element that exists in two metallic allotropes.
text: Polonium is a radioactive element that exists in two metallic allotropes.
text: Polonium exists in two metallic allotropes, the alpha form and the beta form, but as neither form is the least bit attractive to other elements, polonium can't get a date to save its life.
text: Polonium is a radioactive element that exists in two metallic allotropes.