Assertion: metal | /r/HasProperty | discovered
Facets:
Source sentences:
text: By 1900 three metals with atomic numbers less than lead (#82), the heaviest stable metal, remained to be discovered: elements 71, 72, 75.
text: The bomb was based on the nuclear fission of uranium, a metal first thought to have been discovered nearly 150 years earlier.
text: By 1900 three metals with atomic numbers less than lead (#82), the heaviest stable metal, remained to be discovered: elements 71, 72, 75.
text: The bomb was based on the nuclear fission of uranium, a metal first thought to have been discovered nearly 150 years earlier.