The new isotopes258105,257105,254Lr and253Lr

𨧀的同位素

𨧀的同位素.

铋-209

铋-209（209Bi）是铋的同位素之一，具有極微弱的放射性，半衰期長達1.9×1019年. 是鉍最穩定的同位素，也是所有發生α衰變的放射性同位素中已知半衰期最長的. 它有83個質子和126個中子，原子質量爲208.9803987原子質量單位.

Bismuth-209

Bismuth-209 (209Bi) is the isotope of bismuth with the longest known half-life of any radioisotope that undergoes α-decay (alpha decay).

Isotopes of copernicium

Copernicium (Cn) is a synthetic element, and thus a standard atomic mass cannot be given.