Isobar

Isotopes with equal atomic massMass of a neutral atom of a nuclide - also called "atomic weight." The atomic weight of an element is the weighted average of each isotope. Click on Term to Read More. For example, ¹⁰Be, ¹⁰B, and ¹⁰C are isobars. Only one isobar will be stable, the others are radioactive.