Assertion: thorium | /r/HasProperty | th
Facets:
Source sentences:
text: Thorium (Th), radioactive chemical element of the actinoid series of the periodic table, atomic number 90; it is a useful nuclear reactor fuel.
text: Thorium (Th) is a dense (11.7 grams per cubic centimetre) silvery metal that is softer than steel.
text: Thorium (Th) is a weak radioactive element of the actinide series.
text: Thorium (Th) as an element in a member of the Actinide series, a heavy slightly radioactive silvery white metal that is a viable source of nuclear energy.