Bismuth

Bismuth is a chemical element with the symbol Bi and atomic number 83. It is a post-transition metal, radioactive, and one of the pnictogens with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental bismuth may occur naturally, and its sulfide and oxide forms are important commercial ores. The free element is 86% as dense as lead. It is a brittle metal with a silvery-white color when freshly produced, but surface oxidation can give it an iridescent tinge in numerous colours. Bismuth is the most naturally diamagnetic element and has one of the lowest values of thermal conductivityamong metals.

Bismuth was long considered the element with the highest atomic mass that is stable, but in 2003 it was discovered to be extremely weakly radioactive: its only primordial isotope, bismuth-209, decays via alpha decaywith a half-life more than a billion times the estimated age of the universe.Because of its tremendously long half-life, bismuth may still be considered stable for almost all purposes.