Assertion: uranium's number | /r/AtLocation | nature
Facets:
value: as three isotopes
type: MANNER
Source sentences:
text: Plutonium is the element with the highest atomic number to occur in nature.
text: 92238.03(atomic number 92, symbol U) is a metal and chemical element which occurs in nature as three isotopes - U-234, U-235, and U-238.