being 236m Np (t1/2 22.5 hours). The isotopes of neptunium range from 219 Np to 244 Np , though the intermediate isotope 221 Np has not yet been observed...

all of its isotopes above bismuth-209, but is now being resurrected thanks to artificial production of neptunium on the tonne scale. The isotopes neptunium-235...

before 244Pu are isotopes of uranium and neptunium (not considering fission products), and the primary decay products after are isotopes of americium. mPu –...

isotopes of plutonium, having mass numbers 228–247. The most stable isotope of plutonium is 244Pu with half-life of 8.13×107 years. Eighteen isotopes...

often after a series of decays, a stable isotope is reached: there are 251 stable isotopes in the universe. In stable isotopes, light elements typically...

Thallium (81Tl) has 41 isotopes with atomic masses that range from 176 to 216. 203Tl and 205Tl are the only stable isotopes and 204Tl is the most stable...

occurring radioactive element (radioelement) with no stable isotopes. It has two primordial isotopes, uranium-238 and uranium-235, that have long half-lives...

observationally stable isotopes: 204Pb, 206Pb, 207Pb, 208Pb. Lead-204 is entirely a primordial nuclide and is not a radiogenic nuclide. The three isotopes lead-206...

an isotope of actinium. It undergoes alpha decay to francium-221 with a half-life of 10 days, and is an intermediate decay product in the neptunium series...

11 have 5 stable isotopes, 9 have 4 stable isotopes, 5 have 3 stable isotopes, 16 have 2 stable isotopes, and 26 have 1 stable isotope. Additionally, about...