Assertion: cesium | /r/HasProperty | discovered by gustav robert kirchhoff
Facets:
value: in 1860
type: TEMPORAL
value: spectroscopically
type: MANNER
Source sentences:
text: Cesium was discovered by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff, German chemists, in 1860 through the spectroscopic analysis of Durkheim mineral water.
text: Caesium (cesium in USA) was discovered spectroscopically by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff in 1860 in samples of mineral water from Durkheim.