Assertion: berkelium | /r/HasProperty | synthesized by kenneth street
Facets:
value: in december
type: TEMPORAL
value: intentionally
type: MANNER
Source sentences:
text: Berkelium was first intentionally synthesized by Glenn T. Seaborg, Stanley G. Thompson, Albert Ghiorso and Kenneth Street, Jr. in December 1949 using the 60-inch cyclotron at University of California, Berkeley .