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| Antimony | |
|---|---|
| Name | Antimony |
| Atomic number | 51 |
| Category | Metalloid |
| Appearance | Silvery lustrous gray |
| Atomic weight | 121.760 |
| Phase | Solid |
| Density | 6.697 g/cm³ |
| Melting point | 630.63 °C |
| Boiling point | 1587 °C |
| Electron configuration | [Kr]4d10 5s2 5p3 |
| Oxidation states | +5, +3, −3 (common) |
Antimony is a lustrous gray metalloid element with atomic number 51, historically prized for its unique physical properties and versatile chemistry. It has played roles in metallurgy, medicine, and industry from antiquity through modern semiconductor and flame-retardant technologies. The element occupies a position in the periodic table between Tellurium and Tin, and its compounds have influenced developments in alchemy, pharmacopoeia and industrial chemistry.
Human use of the element dates to antiquity, with archaeological artifacts tied to Ancient Egypt, Mesopotamia, and Ancient Greece showing stibnite-derived products used in cosmetics and alloys. Medieval Arabic alchemists such as Jabir ibn Hayyan and practitioners in Persia described compounds and procedures linked to the element during the rise of alchemical traditions. During the Renaissance, figures like Paracelsus referenced remedies containing its compounds; later chemists including Antoine Lavoisier and Dmitri Mendeleev placed it within evolving frameworks of elemental classification that connected to the development of the periodic table. Industrialization in the 19th century, driven by demand from Britain, France, and Germany, expanded mining in Bolivia, China, and Italy, shaping colonial and trade patterns related to mineral extraction.
The element exhibits metalloid behavior with electrical and thermal properties intermediate between metals and nonmetals; its crystalline form is brittle and exhibits a layered structure akin to black phosphorus. Electrically, the element has semiconducting characteristics exploited in early rectifiers and diodes, alongside work by inventors and firms such as Lee De Forest and early 20th-century Bell Telephone Laboratories. Chemically, common oxidation states are +3 and +5; bonding and coordination patterns are explored in studies associated with laboratories at institutions like University of Cambridge and Massachusetts Institute of Technology. Its physical behavior under high pressure and temperature has been probed in experiments at facilities such as CERN-affiliated beamlines and national laboratories in United States Department of Energy networks.
Primary ores include stibnite (antimony sulfide), which has been mined in regions including China, Bolivia, Russia, South Africa, and Kyrgyzstan. Historical mining districts such as Cuzco-era sites and European operations in Saxony and Sicily contributed to early supply chains. Modern extraction combines flotation, roasting, and hydrometallurgical techniques developed in collaboration with industrial research groups at corporations like BASF and Rio Tinto. Secondary recovery from scrap and recycling streams involves metallurgy centers in Japan, South Korea, and Germany, with statutory reporting by agencies including United States Geological Survey and International Energy Agency informing trade flows.
Global production is concentrated in state and private mines in China and strategic stockpiles monitored by ministries such as Ministry of Commerce of the People's Republic of China. Major historical applications include fusible alloys used by inventors such as Benjamin Franklin and typesetting technologies developed by firms like Monotype Imaging. Contemporary uses span flame-retardant formulations for polymers in products regulated under standards from agencies like European Chemicals Agency and U.S. Environmental Protection Agency, lead-acid battery additives used by automotive manufacturers including Toyota and General Motors, and semiconductor precursors for components supplied to companies such as Intel and Samsung Electronics. The element's alloys are also important for bearings and soldering in aerospace programs at organizations such as NASA and ESA.
Key compounds include antimony trioxide, antimony pentoxide, and antimony trisulfide, with coordination chemistry studied in research groups at Max Planck Society and academic departments at Harvard University and University of Oxford. Antimonides of metals such as gallium and indium form III–V semiconductor materials employed in optoelectronics developed by corporations like Nokia and research consortia funded by the European Commission. Historic reagents used in organometallic synthesis and redox chemistry were characterized in work influenced by chemists like Gilbert N. Lewis and later expanded through collaborations at multinational chemical firms including Dow Chemical Company.
The element and many of its compounds have low to moderate toxicity; documented effects were examined in clinical reports at institutions such as Johns Hopkins Hospital and Mayo Clinic when antimony compounds were used therapeutically against diseases like leishmaniasis by public health programs coordinated with the World Health Organization. Occupational exposure studies by agencies such as Occupational Safety and Health Administration and National Institute for Occupational Safety and Health document respiratory and dermal hazards in mining and smelting sectors, with case literature appearing in journals affiliated with American Medical Association and Royal Society of Medicine.
Regulatory frameworks govern production, transport, and use; international trade and chemical safety are overseen by organizations like the World Trade Organization and United Nations Environment Programme through convened conventions and harmonized systems. Regional regulation includes listings and restrictions by the European Chemicals Agency under REACH processes and U.S. controls administered by the Environmental Protection Agency and Department of Transportation. Workplace exposure limits and protective standards are promulgated by Occupational Safety and Health Administration and mirrored in national agencies such as Health Canada and Australia’s Safe Work Australia.