Assertion: neptunium's isotope | /r/HasProperty | lived
Facets:
value: longest
type: DEGREE
Source sentences:
text: Its longest lived isotopes are 237Np, with a half-life of 2.14 million years, 236Np with a half-life of 154,000 years and 235Np with a half-life of 396.1 days.
text: Its longest lived isotope is neptunium-237, with a half life of about two million years.
text: Its longest lived isotope is neptunium-237, with a half life of about two million years.