Copper (element)

Copper (element)
Native_Copper_Macro_Digon3.jpg: “Jonathan Zander (Digon3)" derivative work: Mate · CC BY-SA 3.0 · source
Name	Copper
Atomic number	29
Atomic weight	63.546
Phase	Solid
Category	Transition metal
Appearance	Reddish-orange metal

Copper (element) is a chemical element with symbol Cu and atomic number 29, classified among the transition metals. It is notable for its high electrical and thermal conductivity, malleability, and characteristic reddish color, and it has been central to human technology from ancient metallurgy through modern electronics. Copper occurs widely in the Earth's crust and is extracted, refined, and alloyed by major mining companies and metallurgical operations.

Characteristics

Copper is a ductile, malleable transition metal with a face-centered cubic crystal structure and notable electrical conductivity rivaled only by Silver and Gold among pure metals. It exhibits metallic bonding, a work function that affects electron emission, and well-defined optical properties that produce its characteristic color; these properties are exploited in devices from Edison's early incandescent systems to contemporary International Electrotechnical Commission standards for wiring. Copper's mechanical behavior—yield strength, tensile strength, hardness—can be modified through alloying with Tin, Zinc, Phosphorus and heat treatment in processes practiced by firms such as Rio Tinto and BHP. Corrosion of copper forms patinas such as basic copper carbonate seen on monuments like the Statue of Liberty, and electrochemical potentials underpin its use in cathodic protection systems for infrastructure linked to organizations like American Society of Civil Engineers.

Occurrence and Production

Copper is found in native metallic form and in ores including chalcopyrite, bornite, malachite and chalcocite in ore districts such as Bingham Canyon Mine and Escondida. Major producers include state and private entities like Codelco, Freeport-McMoRan, and Glencore, which operate open-pit and underground mines using flotation, smelting and hydrometallurgical refining methods established in industrial histories involving companies like Kennecott Utah Copper. Concentration and beneficiation occur at mine sites, followed by smelting plants that often engage with regulatory frameworks such as those enforced by the EPA. Global copper markets are influenced by demand from sectors represented by International Copper Study Group data, and by commodity exchanges including the London Metal Exchange.

Applications

Copper's exceptional electrical conductivity makes it indispensable for electrical wiring, motors, power generation and transmission used by utilities such as National Grid and technologies developed by companies like Siemens. Its thermal conductivity and corrosion resistance suit heat exchangers and plumbing in buildings overseen by organizations like the American Society of Heating, Refrigerating and Air-Conditioning Engineers. Copper alloys—bronze and brass—have historical and contemporary roles in coinage minted by institutions such as the United States Mint and in mechanical components for aerospace manufacturers like Boeing. Copper compounds serve as catalysts and pigments in chemical processes regulated by agencies like the European Chemicals Agency, and as antimicrobial surfaces adopted in hospitals such as Mayo Clinic to reduce pathogen transmission. Emerging applications include renewable-energy technologies supported by policies from entities such as the International Renewable Energy Agency.

Biological Role and Toxicity

Copper is an essential trace element for organisms and is a cofactor in enzymes like cytochrome c oxidase and superoxide dismutase characterized in research from institutions such as Rockefeller University and Max Planck Society. Transport and storage proteins including ceruloplasmin and metallothionein are studied in contexts involving clinics like Johns Hopkins Hospital for disorders such as Wilson disease and Menkes disease treated at specialty centers including Great Ormond Street Hospital. Excess copper exposure—documented in case reports from Centers for Disease Control and Prevention—can induce hepatic and neurological toxicity, and occupational exposures are regulated by standards from OSHA. Environmental copper runoff affecting aquatic life has prompted monitoring by agencies like United Nations Environment Programme.

History and Etymology

Copper's use dates to prehistoric metallurgy in regions including Anatolia and the Nile Delta and features in archaeological contexts such as the Bronze Age transition described by scholars at institutions like the British Museum. The English name derives from Old English and Latin roots linked to the island of Cyprus, where Roman mining under authorities like Pliny the Elder was significant. Historical figures such as James Watt and industrial developments during the Industrial Revolution involved copper in steam engines and telegraphy, with supply chains shaped by colonial-era enterprises like the Hudson's Bay Company and modern corporate evolutions exemplified by Anglo American plc.

Isotopes and Nuclear Properties

Copper has two stable isotopes, 63Cu and 65Cu, with nuclear properties documented by laboratories such as CERN and Argonne National Laboratory. Radioisotopes like 64Cu and 67Cu are produced in cyclotrons operated by facilities including National Institutes of Health (NIH-funded centers for use in positron emission tomography and radiopharmaceutical research at hospitals like Massachusetts General Hospital. Nuclear cross sections, decay modes and half-lives are tabulated by agencies such as the International Atomic Energy Agency and inform applications in tracer studies and neutron activation analyses performed at research institutions including Oak Ridge National Laboratory.

Category:Chemical elements