Bismuth

Bismuth
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Name	Bismuth
Atomic number	83
Atomic weight	208.98040
Category	Post-transition metal
Phase	Solid
Color	Silvery white with a pink tinge
Density	9.78 g/cm³
Melting point	271.4 °C
Boiling point	1564 °C
Electron configuration	[Xe] 4f14 5d10 6s2 6p3

Bismuth Bismuth is a chemical element with atomic number 83 and symbol Bi. It is a brittle, crystalline, silvery-white post-transition metal with a distinctive pinkish hue that arises from its electronic structure and relativistic effects. Bismuth occurs in nature primarily as the native element and in various sulfide and oxide minerals, and it has diverse uses spanning metallurgy, pharmaceuticals, and nuclear science.

Properties

Bismuth is characterized by a rhombohedral crystalline structure and a low thermal conductivity, exhibiting an anomalous positive temperature coefficient of electrical resistivity; notable related topics include Pauling electronegativity scale, Madelung rule, Relativistic quantum chemistry, Periodic table, and Lanthanide contraction. Its electron configuration [Xe] 4f14 5d10 6s2 6p3 underpins chemical behavior linked to the inert pair effect, comparisons with Antimony, Polonium, Lead (element), and contrasts with Thallium. Physically, bismuth shows a high diamagnetic susceptibility noted in studies alongside Copper, Silver, Gold, Mercury, and Platinum. Thermal and mechanical properties are discussed in materials contexts such as Metallurgy, Crystal growth, Solid-state physics, Thermoelectric effect, and Seebeck effect.

Occurrence and Production

Bismuth occurs in hydrothermal veins and pegmatites and is extracted from ores such as bismuthinite and bismite; related mining regions include Bolivia, Peru, China, Mexico, and Canada. World production and trade tie into commodity discussions alongside Lead (element), Tin, Copper, Zinc, and Iron ore markets, and extraction often involves smelting and refining techniques employed in Hydrometallurgy, Pyrometallurgy, Roasting (metallurgy), Electrorefining, and Froth flotation. Historically, major producers and companies include Boliden AB, Glencore, Rio Tinto Group, Anglo American plc, and China National Nonferrous Metal Industry Association. Bismuth is also recovered as a by-product of Lead (element) production, Tin production, and Tungsten mining.

Isotopes

Natural bismuth is predominantly the isotope with mass number 209; isotopic research relates to Nuclear physics, Alpha decay, Beta decay, Neutron capture, and facilities like CERN, Brookhaven National Laboratory, Lawrence Berkeley National Laboratory, TRIUMF, and Los Alamos National Laboratory. The long half-life of primordial bismuth-209 is contrasted with synthetic isotopes such as bismuth-210 produced in nuclear reactors, Particle accelerator, Isotope geochemistry, and used in tracer studies akin to isotopes of Uranium, Thorium, Lead (element), and Radium. Isotopic measurement techniques incorporate instrumentation from Mass spectrometry, Gamma spectroscopy, Liquid scintillation counting, Accelerator mass spectrometry, and Neutron activation analysis.

Compounds and Chemistry

Bismuth forms oxides, halides, chalcogenides, and organometallic complexes; key compounds include bismuth(III) oxide, bismuth subcarbonate, bismuth(III) sulfide, and bismuth(III) chloride, discussed in relation to reagents used in Inorganic chemistry, Coordination chemistry, Solid-state chemistry, Crystal field theory, and Ligand field theory. Bismuth catalysis connects to Lewis acids, Organocatalysis, Homogeneous catalysis, Heterogeneous catalysis, and applications in synthesis paralleling catalysts based on Palladium, Rhodium, Ruthenium, Copper, and Iron (element). Notable synthetic pathways and reactions reference methods from Grignard reaction, Friedel–Crafts reaction, Cross-coupling reaction, Hydroamination, and Asymmetric synthesis. Solid-state bismuth chalcogenides intersect with thermoelectric materials research alongside Bismuth telluride, Skutterudite, Half-Heusler alloys, Thermoelectric generators, and Topological insulators.

Applications

Bismuth and its compounds are used in pharmaceuticals such as bismuth subsalicylate and bismuth subnitrate, linking to institutions like Food and Drug Administration, World Health Organization, Centers for Disease Control and Prevention, Mayo Clinic, and Johns Hopkins Hospital. Metallurgical uses include low-melting alloys for Fusible alloy products, sold by manufacturers such as Bismuth Corporation and used in industries represented by General Electric, Siemens, Boeing, Airbus, and Lockheed Martin. Bismuth-based materials are important in thermoelectric devices, magnetic sensors, and solders relevant to Intel, Samsung, TSMC, IBM, and NVIDIA. In nuclear medicine and radiopharmaceuticals, bismuth isotopes interact with technologies and organizations including International Atomic Energy Agency, European Organisation for Nuclear Research, Memorial Sloan Kettering Cancer Center, and Mayo Clinic research programs.

Biological and Environmental Effects

Bismuth compounds have been used medically for gastrointestinal disorders and topical applications, with clinical studies and regulatory oversight involving National Institutes of Health, Food and Drug Administration, European Medicines Agency, Cochrane Collaboration, and World Health Organization. Toxicological profiles compare bismuth to heavy metals like Lead (element), Cadmium, Mercury, Arsenic, and Thallium in environmental monitoring by agencies such as Environmental Protection Agency, Environment Canada, European Environment Agency, United Nations Environment Programme, and Greenpeace. Environmental pathways include mining runoff, smelting emissions, atmospheric deposition, and remediation techniques akin to Phytoremediation, Soil washing, Activated carbon, and Constructed wetlands. Occupational exposure standards are governed by organizations such as Occupational Safety and Health Administration, National Institute for Occupational Safety and Health, British Health and Safety Executive, and International Labour Organization.

History and Etymology

Historically, bismuth-containing ores were known to medieval and early modern miners and alchemists; narratives involve figures and entities like Geber, Paracelsus, Galen, Pliny the Elder, Avicenna, and enterprises in regions such as Tyrol, Bohemia, Alsace, Saxony, and Galicia. The element’s identification and naming are tied to early chemists and mineralogists including Andreas Libavius, Georgius Agricola, Berzelius, Antoine Lavoisier, Marie-Anne Paulze Lavoisier, and institutions like Royal Society, Académie des sciences, University of Göttingen, and University of Vienna. Etymology connects to terms used in historical texts and trade, repertoire of names recorded in works such as De Natura Fossilium and catalogues by Kirwan (chemist), with modern nomenclature standardized by bodies like International Union of Pure and Applied Chemistry.

Category:Chemical elements