Assertion: nickel | /r/HasProperty | isolated
Facets:
Source sentences:
text: Nickel was first isolated and classified as a chemical element in 1751 by Axel Fredrik Cronstedt, who initially mistook the ore for a copper mineral, in the cobalt mines of Los, Hälsingland, Sweden.
text: Nickel was used industrially as an alloying metal almost 2,000 years before it was isolated and recognized as a new element.
text: It was from this ore, studied by Axel Fredrik Cronstedt, that nickel was isolated and recognized as a new element in 1751.