Isobar (nuclide)

Isobar (from Greek ἴσος isos, equal to ' and βαρύς Barys, hard ') are nuclides of two different chemical elements (and therefore also of different atomic number / number of protons and thus neutrons), whose nuclei have the same number of nucleons (same mass number ).

Is there a difference the atomic number of two isobars only 1, so is always one of these radioactive nuclides ( Mattauchsche Isobarenregel ).

Examples

A special case of the isobars are the so-called mirror nuclei.