Assertion: neptunium's isotope | /r/HasProperty | discovered
Facets:
Source sentences:
text: As the first isotope of neptunium to be discovered has such a short half-life, McMillan and Abelson were unable to prepare a sample that was large enough to perform chemical analysis of the new element using the technology that was then available.
text: The main reason it wasn’t used in nuclear weapons is simply that uranium and plutonium research was already established before the relatively stable neptunium-237 isotope was discovered.
text: Francium-223 is the most stable isotope, with a half-life of 21.8 minutes, and it is highly unlikely that an isotope of francium with a longer half-life will ever be discovered or synthesized.