Assertion: compound's element | /r/HasProperty | discovered by french chemist
Facets:
value: in 1875
type: TEMPORAL
value: according to chemistry explained
type: OTHER
Source sentences:
text: The element was first discovered by the French chemist Paul-Émile Lecoq de Boisbaudran in 1875, who had been studying the spectra of the chemical elements for 15 years (spectra are the lines produced when chemical elements are heated), according to Chemistry Explained.