Assertion: technetium | /r/HasProperty | rare
Facets:
value: very
type: DEGREE
Source sentences:
text: Technetium is so rare because the half-lives of 97Tc and 98Tc are only 4.2 million years.
text: Technetium was once very rare and expensive but is now obtained in quantity from nuclear reactor fission products.
text: Technetium was once very rare and expensive but is now obtained in quantity from nuclear reactor fission products.
text: Technetium was once very rare and expensive but is now obtained in quantity from nuclear reactor fission products.
text: Technetium was once very rare and expensive but is now obtained in quantity from nuclear reactor fission products.
text: Technetium was once very rare and expensive but is now obtained in quantity from nuclear reactor fission products.