Assertion: noble gas | /r/HasAspect | multiple stable isotopes
Facets:
Source sentences:
text: The noble gases up to xenon have multiple stable isotopes.
text: The five noble gases that have stable isotopes are helium (He), neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe).
text: The noble gases up to xenon have multiple stable isotopes.