bismuth215
Bismuth-215 is an isotope of bismuth. Bismuth is a chemical element with the symbol Bi and atomic number 83. It is a post-transition metal and one of the heaviest stable elements. Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. Bismuth-215 has an atomic mass of approximately 215 atomic mass units.
Radioactive isotopes of bismuth, such as bismuth-215, are unstable and undergo radioactive decay. Bismuth-215 is a