Assertion: cesium | /r/HasProperty | discovered with spectroscope
Facets:
Source sentences:
text: Cesium was the first element to be discovered with a spectroscope.
text: Cesium was the first element discovered using a spectroscope.
text: Because of the bright blue lines in the emission spectrum, they derived the name from the Latin word caesius, meaning sky-blue.[note 6] Caesium was the first element to be discovered with a spectroscope, which had been invented by Bunsen and Kirchhoff only a year previously.
text: Cesium was the first metal to be discovered by the spectroscope (invented the year before), along with rubidium.