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| AG | |
|---|---|
| Name | Silver |
| Atomic number | 47 |
| Atomic weight | 107.8682 |
| Phase | Solid |
| Category | Transition metal |
| Appearance | Lustrous white metal |
AG
Silver is a chemical element with symbol Ag and atomic number 47, known for its high electrical conductivity, malleability, and lustrous appearance. It is found in native form and in ores, has extensive historical use in coinage, jewelry, and ornamentation, and plays a critical role in modern electronics, photography, and antimicrobial applications. Silver intersects with many industries, institutions, and historical events, influencing trade, exploration, and technological development.
The name derives from the Old English "seolfor" and the Latin "argentum", reflecting links to languages such as Old High German, Sanskrit, and Ancient Greek; the chemical symbol Ag is taken from argentum. The Latin root connects to medieval European practices recorded by scholars like Pliny the Elder and traders on routes such as the Silk Road and Amber Road. Nomenclature decisions in the 19th century involved chemists associated with institutions like the Royal Society and the Académie des Sciences.
Silver is a transition metal in the Periodic Table located between Cadmium and Palladium, displaying typical metallic bonding and a face-centered cubic crystal structure noted in works by scientists at University of Cambridge and ETH Zurich. It has the highest electrical conductivity of all elements, a property exploited in inventions recorded by figures such as Thomas Edison and innovators at Bell Laboratories. Silver's thermal conductivity and reflectivity made it central to developments in optical instrumentation used at observatories like Mount Wilson Observatory and in photographic processes pioneered by Louis Daguerre and Henry Fox Talbot.
Natural silver occurs in native form and in ores such as argentite and chlorargyrite, historically mined in regions including Potosí, Broken Hill, Kongsberg, and Klondike. Major extraction techniques evolved from amalgamation and cupellation used in colonial operations linked to Spanish Empire fleets to modern electrolytic refining and cyanidation developed by industrial chemists associated with companies like Rio Tinto and Barrick Gold. Geological settings include epithermal veins studied in conjunction with research at institutions like the United States Geological Survey and the Geological Survey of Canada.
Silver's electrical conductivity makes it essential in contacts, conductors, and printed circuit components used by firms such as Intel and Samsung Electronics; its reflectivity is used in mirrors and telescope coatings maintained at observatories like Palomar Observatory. Photographic and imaging applications were transformed by processes from studios of Ansel Adams and firms like Kodak before the digital era dominated by companies such as Canon and Sony. Silver's antimicrobial properties are utilized in medical devices and wound dressings developed at hospitals like Mayo Clinic and research centers including Johns Hopkins University. Other uses span coinage and bullion traded on markets such as the London Metal Exchange and the New York Mercantile Exchange, and in jewelry crafted in ateliers across Florence, Istanbul, and Mumbai.
Silver exhibits low chemical reactivity in bulk, but ionic and nanoparticulate forms interact with biological systems; toxicology research at National Institutes of Health and Centers for Disease Control and Prevention examines absorption, distribution, and excretion. Overexposure to silver compounds can cause argyria, a dermal discoloration historically documented in clinical reports from hospitals like Massachusetts General Hospital and case studies published through World Health Organization channels. Medical applications balance antimicrobial benefits investigated in trials at Cleveland Clinic against potential environmental impacts assessed by agencies such as the Environmental Protection Agency.
Silver has driven exploration and empire-building, exemplified by the wealth of Potosí fueling the Spanish Empire and the silver rushes in California Gold Rush and Klondike Gold Rush that shaped migration and settlement. Monetary systems, including the Bretton Woods system debates and the coinage policies of institutions like the United States Mint and the Royal Mint, were influenced by silver supplies and standards. Cultural artifacts—religious chalices, regalia, and decorative arts from Mughal Empire workshops to Renaissance silversmiths—reflect silver's symbolic and economic value, documented in collections at museums such as the British Museum and the Hermitage Museum.
Regulation of silver involves commodity trading oversight by exchanges like the London Metal Exchange and national regulation by agencies including the Securities and Exchange Commission and the Commodity Futures Trading Commission in the United States. Environmental and workplace standards for mining and refining are enforced through laws and agencies such as the Clean Air Act implementation by the Environmental Protection Agency and occupational limits set by organizations like Occupational Safety and Health Administration. International trade in silver is influenced by treaties and agreements administered through bodies like the World Trade Organization and customs procedures in countries ranging from China to Peru.