Assertion: thorium | /r/HasProperty | element
Facets:
Source sentences:
text: Thorium is an element that was discovered by a Swedish chemist named Jons Jakob Berzelius in the year 1828.
text: Uranium and Thorium are two of the three elements that can undergo radioactive decay significantly and are found in large amounts in nature comparatively.
text: These are the elements that are placed on Row7 of the periodic table.