Assertion: selenium | /r/HasProperty | discovered by jöns jacob berzelius
Facets:
value: in 1817
type: TEMPORAL
value: after analyzing an impurity
type: TEMPORAL
Source sentences:
text: Selenium was discovered by Jöns Jacob Berzelius, a Swedish chemist, in 1817 after analyzing an impurity that was contaminating the sulfuric acid (H 2 SO 4 ) being produced at a particular factory in Sweden.