Assertion: cerium | /r/HasProperty | discovered by jöns jakob berzelius
Facets:
value: in 1803
type: TEMPORAL
value: by martin heinrich klaproth
type: OTHER
Source sentences:
text: Cerium was discovered by Jöns Jakob Berzelius and Wilhelm Hisinger (SE) in 1803 and independently by Martin Heinrich Klaproth (DE).