Assertion: hydrogen | /r/HasProperty | recognized as distinct element
Facets:
value: by henry cavendish
type: OTHER
value: in 1766
type: TEMPORAL
Source sentences:
text: Hydrogen was first recognized as a distinct element by Henry Cavendish in 1766.
text: Hydrogen was first recognized as a distinct element in 1766 by English scientist Henry Cavendish, when he prepared it by reacting hydrochloric acid with zinc.