Silver (element)

Silver (element)
Alchemist-hp (talk) (www.pse-mendelejew.de) · CC BY-SA 3.0 de · source
Name	Silver
Atomic number	47
Atomic mass	107.8682
Category	Transition metal
Appearance	Lustrous white metal
Phase	Solid
Discovered	Antiquity
Electron configuration	[Kr] 4d10 5s1
Density	10.49 g/cm3
Melting point	961.8 °C
Boiling point	2162 °C

Silver (element) Silver is a lustrous, white transition metal with the chemical symbol Ag and atomic number 47. It is notable for the highest electrical and thermal conductivity of all metals, prominent roles in metallurgy, coinage, photography, and electronics, and a long cultural association with currency and ornamentation. Silver occurs in native form and in ores with elements such as copper and lead, and it has a range of well-characterized isotopes and coordination chemistry.

Characteristics

Silver is a transition metal with a face-centered cubic crystal structure found in native Mexico City deposits historically tied to New Spain mining. Its electron configuration, [Kr] 4d10 5s1, gives rise to strong metallic bonding and exceptional electrical conductivity exploited in Bell Telephone Laboratories developments and Intel semiconductor interconnect research. Silver's thermal conductivity underpinned early heat-sink designs at institutions like General Electric and influenced materials chosen for Apollo program spacecraft instrumentation. Optical properties, including high reflectivity across visible wavelengths, made silver essential for astronomy mirror coatings used in observatories such as Mount Wilson Observatory and influenced reflective tooling at firms like Zeiss. Mechanically, silver is malleable and ductile, used in fine wires by companies such as Siemens and Philips Electronics for precision components.

Occurrence and production

Major silver deposits have been mined in regions historically associated with Potosí, Broken Hill, Laurentian Shield, and Mendoza Province operations; modern output derives from integrated mining complexes owned by corporations including Glencore, Barrick Gold, and Anglo American. Primary ores include argentite and chlorargyrite found alongside sulfide minerals in polymetallic veins studied in Cornwall and Bohemia. Secondary recovery from copper, lead, and zinc smelting at refineries such as Kennecott and Rio Tinto remains important. Byproduct silver from Chuquicamata and Asarco operations supplements production, while recycling streams from electronics manufacturers like Intel Corporation and jewelers tied to Cartier and Tiffany & Co. supply refined metal through facilities at Johnson Matthey and Heraeus. Global trade of bullion and coins occurs in financial centers including London Stock Exchange, New York Stock Exchange, and Tokyo, with price discovery influenced by activity at exchanges and events like the 1971 United States gold policy changes.

Isotopes and nuclear properties

Naturally occurring silver consists of two stable isotopes, 107Ag and 109Ag, historically measured at institutions like Lawrence Berkeley National Laboratory and Los Alamos National Laboratory. Radioisotopes such as 110mAg and 111Ag have been produced in reactors at facilities like Oak Ridge National Laboratory and Handford Site for activation analysis and tracer studies used by researchers at Max Planck Society and CNRS. Silver shows neutron capture properties relevant to control rods and detection media in experiments at CERN and Fermilab; cross-section data informed design work at Brookhaven National Laboratory. Medical and industrial uses of isotopes have been explored by Mayo Clinic and aerospace firms such as Boeing for radiography sources, though many applications favor alternative nuclides regulated by agencies like the International Atomic Energy Agency.

Chemical compounds and reactions

Silver forms monovalent compounds such as silver nitrate and silver chloride; historic synthesis and applications were advanced at institutions like University of Göttingen and University of Cambridge. Silver halides (AgCl, AgBr, AgI) are light-sensitive and underpinned photographic chemistry developed by inventors associated with Eastman Kodak and practitioners at Royal Photographic Society. Coordination complexes with ligands were characterized in studies from University of Zurich and ETH Zurich, informing catalysis research at MIT and Stanford University into silver-catalyzed cycloaddition and oxidation reactions. Silver oxide finds use in organic synthesis protocols taught at Harvard University and California Institute of Technology. Silver readily forms amalgams with mercury, a property exploited historically by miners in Potosí and scrutinized during environmental assessments by United States Environmental Protection Agency.

Applications and uses

Silver's superior electrical conductivity makes it critical for high-performance conductors used by NVIDIA, Samsung, and NASA missions; contacts and switchgear manufactured by firms such as ABB and Schneider Electric rely on silver alloys. Reflective coatings on mirrors and architectural glass have been applied by contractors and suppliers associated with Skidmore, Owings & Merrill and Foster + Partners. Silver compounds were central to photographic media mass-produced by Eastman Kodak and exhibited in collections of the Metropolitan Museum of Art. Antimicrobial properties motivated medical device coatings in hospitals like Cleveland Clinic and products by medical firms such as Medtronic and Smith & Nephew. Jewelry and bullion markets are dominated by houses like Tiffany & Co. and PAMP Suisse, while coinage minted by national mints such as the Royal Canadian Mint and United States Mint persists for investment and commemorative purposes. Emerging uses include printed electronics developed in collaboration between Samsung Electronics and research labs at Imperial College London and silver-based catalysts for green chemistry projects at ETH Zurich.

History and etymology

Silver has been known since antiquity, used by civilizations including the Ancient Egyptians, Sumerians, Mycenaeans, and Mayan civilization for ornaments, trade, and ritual artifacts found in collections at the British Museum and Louvre. Major historical mines at Laurium and Potosí shaped geopolitics involving entities like the Spanish Empire and Hapsburg dynasty, while trade routes connecting Silk Road cities and Venice transmitted silver coinage and techniques. The element's name derives from Old English seolfor and Proto-Germanic *wilba- and shares roots with terms found in texts from Tacitus and inscriptions catalogued by British Library scholars. Advances in assay, refining, and minting at institutions such as the Royal Mint and innovations by figures like Hennig Brand and organizations like the East India Company influenced global valuation and monetary systems through periods including the Thirty Years' War and the Industrial Revolution.

Category:Chemical elements