Alpha nuclide

Alpha nuclide is also shorthand for alpha radionuclide, referring to those radioactive isotopes that undergo alpha decay and thereby emit alpha particles.

List of alpha nuclides

The entries for ³⁶Ar and ⁴⁰Ca are theoretical: they would release energy on decay, but the process has never been observed, and the half-lives are probably extremely long. Likewise, the chains for masses 64, 84, 92, and 96 theoretically can continue one more step by double electron capture (to ⁶⁴Ni, ⁸⁴Kr, ⁹²Zr, and ⁹⁶Mo respectively), but this has never been observed.

As of 2024, the heaviest known alpha nuclide is xenon-108.