Assertion: astatine | /r/HasProperty | synthesized by corson
Facets:
value: in 1940
type: TEMPORAL
value: by bombarding bismuth
type: MANNER
value: at the university of california
type: LOCATION
Source sentences:
text: Astatine was first synthesized by Corson, MacKenzie, and Segre at the University of California in 1940 by bombarding bismuth with alpha particles.