Assertion: californium | /r/HasProperty | synthesized by kenneth street jr.
Facets:
value: in 1950
type: TEMPORAL
Source sentences:
text: Californium is a radioactive element first synthesized by Stanley G. Thompson, Kenneth Street Jr., Albert Ghioirso, and Glen Seaborg in 1950 at the Lawrence Berkeley National Laboratory at the University of California, from which it takes its name.