Assertion: berkelium | /r/CreatedBy | stan thomson
Facets:
value: by bombarding the isotope
type: MANNER
Source sentences:
text: Berkelium was first made some 60 years ago by Stan Thomson, Al Ghiroso and Glen Seaborg by bombarding the isotope americium-241 with alpha particles.
text: Berkelium was first made some 60 years ago by Stan Thomson, Al Ghiroso and Glen Seaborg by bombarding the isotope americium-241 with alpha particles.