Assertion: technetium | /r/HasProperty | unusual light elements
Facets:
value: among the light elements
type: OTHER
Source sentences:
text: Technetium and promethium are unusual light elements in that they have no stable isotopes.
text: Technetium and promethium are unusual among the light elements, because they have no stable isotopes.
text: Technetium and promethium are unusual light elements in that they have no stable isotopes.
text: Technetium and promethium are unusual light elements in that they have no stable isotopes.