tin

tin
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Name	Tin
Atomic number	50
Appearance	silvery-white metal
Category	post-transition metal
Group	14
Electron configuration	[Kr] 4d10 5s2 5p2
Density	7.31 g/cm3
Melting point	231.93 °C
Boiling point	2602 °C
Discoverer	Known since antiquity

tin Tin is a malleable, silvery-white post-transition metal with atomic number 50 used historically and industrially across metallurgy, electronics, and chemistry. It exhibits allotropy, distinct oxidation states, and notable alloys, and it has played central roles in trade networks, technological revolutions, and international commodity markets. Major producers, cultural centers, and scientific institutions have driven tin research, extraction, and regulation through decades of technological change.

Characteristics

Tin exists primarily in two allotropes: the metallic beta form and the brittle alpha form, each with distinct crystallography studied by researchers at University of Cambridge, Massachusetts Institute of Technology, Max Planck Society, Imperial College London, and ETH Zurich. Its electronic configuration leads to a filled 4d subshell and two 5p electrons, a subject discussed in texts from Royal Society publications to monographs by Linus Pauling and analyses at Lawrence Berkeley National Laboratory. Tin's oxide layers and surface chemistry have been characterized using techniques developed at CERN, Argonne National Laboratory, Brookhaven National Laboratory, and Oak Ridge National Laboratory. Thermal properties and phase transitions are topics in materials science curricula at California Institute of Technology, Stanford University, University of Tokyo, Peking University, and University of Oxford. Mechanical behavior under stress is investigated in collaborations involving Bureau of Mines, National Institute of Standards and Technology, Fraunhofer Society, Tata Steel, and Hitachi Metals.

Occurrence and Production

Commercial tin is primarily derived from cassiterite (SnO2), mined in regions associated with enterprises and governments such as Bolivia operations linked to Comibol, Indonesian concessions in Bangka-Belitung controlled historically by companies like Tinplate Company subsidiaries, and Malaysian deposits exploited by partnerships involving Glencore and Freeport-McMoRan. Mining districts in Cornwall and Devon were instrumental during the Industrial Revolution, alongside fields in Peru, China, Vietnam, Nigeria, and Thailand. Smelting and refining have been developed by industrial groups such as Rio Tinto, Anglo American, China Tin Group, and national laboratories including CSIRO. Secondary production from recycling streams involves electronics dismantling facilities at Foxconn, automotive recycling centers affiliated with Toyota, General Motors, and urban mining initiatives promoted by United Nations Environment Programme and World Bank programs. Commodity pricing and trade flows are tracked by exchanges and organizations like the London Metal Exchange, International Tin Association, World Trade Organization, International Tin Research Institute, and national ministries such as Ministry of Industry and Trade (Indonesia). Environmental permitting and land reclamation follow guidelines from agencies including Environmental Protection Agency, European Commission, Ministry of Ecology and Environment of the People's Republic of China, and regional authorities in Queensland.

History and Uses

Tin has been used since the Bronze Age in alloying with copper to form bronze, a topic central to archaeological investigations by teams from British Museum, Smithsonian Institution, Metropolitan Museum of Art, Louvre Museum, and excavations at Çatalhöyük, Ur, Knossos, Sardinia, and Syria. Trade in tin shaped routes connected to Silk Road, Phoenicia, Minoan civilization, and later European colonial ventures involving East India Company and Dutch East India Company. Industrial applications expanded with tinplate production and canning innovations by inventors linked to Napoleon Bonaparte era logistics and firms like Birmingham Small Arms Company and Vickers. Modern uses include solder alloys essential to electronics manufactured by corporations such as Intel, Samsung Electronics, Sony, Siemens, and Apple Inc.; plating for corrosion resistance used by General Electric and Siemens Energy; and organotin compounds formerly used as biocides in marine paints regulated after studies by International Maritime Organization and World Health Organization. Tin's role in superconducting and quantum materials research appears in work from IBM Research, Harvard University, University of California, Berkeley, and National Institute for Materials Science.

Compounds and Chemistry

Tin forms compounds in oxidation states +2 and +4, with stannous and stannic chemistry explored in syntheses reported by research groups at California Institute of Technology, University of Cambridge, Max Planck Institute for Chemistry, Massachusetts Institute of Technology, and Tohoku University. Important inorganic compounds include tin(IV) oxide and tin(II) chloride, whose catalytic and electronic properties are studied for photovoltaics by teams at National Renewable Energy Laboratory, Fraunhofer ISE, Toyota Central R&D Labs, and Sharp Corporation. Organotin chemistry, involving tributyltin and triphenyltin, was developed by industrial chemists at Shell, Bayer, and Monsanto and later regulated following ecotoxicology research at Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, and Duke University. Coordination complexes and cluster chemistry of tin appear in publications from Riken, University of California, Los Angeles, Princeton University, and University of Illinois Urbana-Champaign. Tin halides, used as precursors in organic synthesis and materials deposition, are commercially supplied by firms such as Merck Group and Sigma-Aldrich.

Isotopes and Nuclear Properties

Naturally occurring tin has ten stable isotopes, a subject of nuclear structure studies at facilities like CERN, TRIUMF, RIKEN Nishina Center, Brookhaven National Laboratory, and GANIL. Neutron capture and cross-section data relevant to reactor physics have been measured by teams at Oak Ridge National Laboratory, Idaho National Laboratory, Institut Laue–Langevin, and Los Alamos National Laboratory. Radioisotopes such as tin-117m have medical and industrial applications investigated in collaborations involving Mayo Clinic, Johns Hopkins University, and radiopharmaceutical companies. Nuclear astrophysics studies examine tin isotopes in processes modeled by researchers at Princeton Plasma Physics Laboratory and Max Planck Institute for Astrophysics.

Health, Safety, and Environmental Impact

Metallic tin has low acute toxicity, but organotin compounds demonstrated endocrine disruption and marine toxicity in studies by United Nations Environment Programme, European Chemicals Agency, National Toxicology Program, Environmental Protection Agency, and academic centers such as University of Exeter and University of California, Davis. Occupational exposure standards are enforced by agencies like Occupational Safety and Health Administration, Health and Safety Executive, and Safe Work Australia, while remediation and monitoring involve laboratories at US Geological Survey and Environment Agency (England and Wales). International agreements addressing persistent pollutants implicated in tin chemistry are influenced by negotiations at Stockholm Convention sessions and guidance from World Health Organization panels. Recycling and lifecycle assessments are subjects of sustainability initiatives at United Nations Industrial Development Organization, International Tin Association, and corporate sustainability programs at Panasonic, LG Electronics, and Whirlpool Corporation.

Category:Chemical elements