Assertion: thorium | /r/AtLocation | the +4 oxidation state
Facets:
value: with uranium(iv
type: OTHER
Source sentences:
text: In nature, thorium occurs in the +4 oxidation state, together with uranium(IV), zirconium(IV), hafnium(IV), and cerium(IV), and also with scandium, yttrium, and the trivalent lanthanides which have similar ionic radii.