Assertion: proton's life | /r/HasProperty | 31 known radionuclides
Facets:
value: with half-lives
type: OTHER
Source sentences:
text: The predicted half-lives for these nuclides often greatly exceed the estimated age of the universe, and in fact there are also 31 known radionuclides (see primordial nuclide) with half-lives longer than the age of the universe.