Assertion: berkelium | /r/HasProperty | radioactive rare earth metal
Facets:
Source sentences:
text: Berkelium is a radioactive rare earth metal, named after the University of California at Berkeley (USA).
text: Berkelium is a radioactive rare earth metal, discovered in 1949 by Glenn T. Seaborg, Stanley G. Thompson and Albert Ghiorso, and named after the University of California at Berkeley, USA.