Assertion: technetium | /r/HasProperty | first of the two elements
Facets:
Source sentences:
text: Technetium ( 43 Tc) is the first of the two elements lighter than bismuth that have no stable isotopes; the other such element is promethium.
text: Technetium ( 43 Tc) is the first of the two elements lighter than bismuth that have no stable isotopes; the other such element is promethium.