Bismuth

Bismuth is a chemical element; it has symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens, with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental bismuth occurs 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. Surface oxidation generally gives samples of the metal a somewhat rosy cast. Further oxidation under heat can give bismuth a vividly iridescent appearance due to thin-film

Bismuth-209 (Bi) is an isotope of bismuth with the longest known half-life of any nuclide that undergoes α-decay (alpha decay); the decay product is thallium-205. It has 83 protons and a magic number of 126 neutrons, and naturally-occurring bismuth consists entirely of this isotope.

Star with an overabundance of lead

industrial process for purification of lead from bullion

The bismuthide ion is but the term is often used to describe less reduced forms of bismuth.

alloy of lead and bismuth used as a coolant in nuclear reactors

plutonium extraction process