Assertion: protactinium | /r/AtLocation | trace quantities
Facets:
value: naturally
type: MANNER
Source sentences:
text: Found naturally only in trace quantities and seminal to alternate nuclear reactor fuels, protactinium is an extremely rare element that could reveal new trends among nearby actinide elements, including uranium.
text: Found naturally only in trace quantities and seminal to alternate nuclear reactor fuels, protactinium is an extremely rare element that could reveal new trends among nearby actinide elements, including uranium.