Copper is a chemical element with the symbol Cu (from Latin: cuprum) and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; a freshly exposed surface has a reddish-orange color. It is used as a conductor of heat and electricity, a building material, and a constituent of various metal alloys.
The metal and its alloys have been used for thousands of years. In the Roman era, copper was principally mined on Cyprus, hence the origin of the name of the metal as сyprium (metal of Cyprus), later shortened to сuprum. Its compounds are commonly encountered as copper(II) salts, which often impart blue or green colors to minerals such as turquoise and have been widely used historically as pigments. Architectural structures built with copper corrode to give green verdigris (or patina). Decorative art prominently features copper, both by itself and as part of pigments.
Copper(II) ions are water-soluble, where they function at low concentration as bacteriostatic substances, fungicides, and wood preservatives. In sufficient amounts, they are poisonous to higher organisms; at lower concentrations it is an essential trace nutrient to all higher plant and animal life. The main areas where copper is found in animals are liver, muscle and bone.
Other articles related to "copper":
... comprises the "Enterprise" underground copper mine, X41 underground copper mine, "Black Star Open Cut" silver-lead zinc mine, and metallurgical processing facilities ... Mount Isa is in the top two of the largest copper mining and smelting operations in the country ... Copper and lead are smelted on site, with copper anodes and zinc concentrate being transported 900 km to the city and port of Townsville on the east coast ...
... Associated minerals include prehnite, danburite, babingtonite, epidote, native copper, calcite, quartz and zeolites ... It is common in the copper deposits of the Lake Superior region of Michigan ... the coloration is due to the inclusion of copper or associated minerals in progressive stages of hydrothermal precipitation ...
... Because of its role in facilitating iron uptake, copper deficiency can produce anemia-like symptoms, neutropenia, bone abnormalities, hypopigmentation, impaired growth, increased ... Conversely, Wilson's disease causes an accumulation of copper in body tissues ... Severe deficiency can be found by testing for low plasma or serum copper levels, low ceruloplasmin, and low red blood cell superoxide dismutase levels these are not sensitive to marginal copper status ...
... fluid or tissue in a hydrochloric acid solution Insert a copper strip into the solution ... The appearance of a silvery coating on the copper may indicate Mercury ... for the determination of its half-life, reductive deposition of selenium on metallic copper was the first step to extract 79Se from high active raffinate (= PUREX raffinate) in a hot cell ...
... Oxiana Limited (ASX OXR) was an Australia-based copper and gold miner and exploration company ... the operation and development of the Sepon copper and gold project in South East Laos, the Golden Grove copper/zinc mine in Western Australia and development of the Prominent Hill copper/gold ...
Famous quotes containing the word copper:
“He had put, within his reach,
A box of counters and a red-veined stone,
A piece of glass abraded by the beach,
And six or seven shells,
A bottle with bluebells,
And two French copper coins, ranged there with careful art,”
—Coventry Kersey Dighton Patmore (18231896)