The next longest-living nuclide after the end of the list given in the table is niobium-92 with a half-life of.
A nucleus is the kernel of a specific atom, and a nuclide is a certain element.
Each material consists of a list of (nuclide, fraction) pairs where the nuclide is in the range 1 (hydrogen) through 94 (plutonium).
All odd mass numbers have only one beta decay stable nuclide.
Plutonium nuclides are so low as to be scarcely detectable.
Nuclides that are produced by radioactive decay are called radiogenic nuclides, whether they themselves are stable or not.
There are about 355 known beta-decay stable nuclides total.
The most measured quantities in research on nuclear fission are the charge and mass fragments yields for uranium-235 and other fissile nuclides.
