Assertion: chlorine dioxide's chlorine | /r/HasProperty | recognized as gas
Facets:
value: by physician jan baptist van
type: OTHER
value: around 1630
type: TEMPORAL
value: by the flemish chemist
type: OTHER
Source sentences:
text: Around 1630, chlorine was recognized as a gas by the Flemish chemist and physician Jan Baptist van Helmont.[note 1]