Assertion: compound's element | /r/HasProperty | discovered
Facets:
Source sentences:
text: The discovery of phosphorus, the first element to be discovered that was not known since ancient times, is credited to the German alchemist Hennig Brand in 1669, although other chemists might have discovered phosphorus around the same time.
text: The name wolfram comes from the mineral the element was discovered in, wolframite.
text: Its existence was predicted by Dmitri Mendeleev in 1869, though it was not identified until 1923, by Coster and Hevesy, making it the last stable element to be discovered.