Assertion: hydrogen | /r/HasProperty | unstable
Facets:
Source sentences:
text: He believed that H 3 + would be unstable, but that reacting H 2 − with H+ could yield neutral H 3 .
text: He believed that H 3 was a stable molecule and wrote and lectured about it.
text: Triatomic hydrogen or H 3 is an unstable triatomic molecule containing only hydrogen.