Search results
Results from the WOW.Com Content Network
In alchemy the symbol for copper was also the symbol for the goddess and planet Venus. Chalcolithic copper mine in Timna Valley, Negev Desert, Israel. In Greece, copper was known by the name chalkos (χαλκός). It was an important resource for the Romans, Greeks and other ancient peoples.
Copper is a chemical element with the symbol Cu (from Latin: cuprum) and the atomic number of 29. It is easily recognisable, due to its distinct red-orange color.Copper also has a range of different organic and inorganic salts, having varying oxidation states ranging from (0,I) to (III).
Copper occurs in its native form in Chile, China, Mexico, Russia and the USA. Various natural ores of copper are: copper pyrites (CuFeS 2), cuprite or ruby copper (Cu 2 O), copper glance (Cu 2 S), malachite (Cu(OH) 2 CuCO 3), and azurite (Cu(OH) 2 2CuCO 3). Copper pyrite is the principal ore, and yields nearly 76% of the world production of copper.
Yttrium barium copper oxide (YBa 2 Cu 3 O 7) consists of both Cu(II) and Cu(III) centres. Like oxide, fluoride is a highly basic anion [19] and is known to stabilize metal ions in high oxidation states. Both copper(III) and even copper(IV) fluorides are known, K 3 CuF 6 and Cs 2 CuF 6, respectively. [1]
Copper (29 Cu) has two stable isotopes, 63 Cu and 65 Cu, along with 28 radioisotopes. The most stable radioisotope is 67 Cu with a half-life of 61.83 hours. Most of the others have half-lives under a minute. Unstable copper isotopes with atomic masses below 63 tend to undergo β + decay, while isotopes with atomic masses above 65 tend to ...
The naturally occurring mineral binary compounds of copper and sulfur are listed below. Investigations of covellite indicate that there are other metastable Cu-S phases still to be fully characterised. [1] CuS 2, villamaninite [2] or (Cu,Ni,Co,Fe)S 2 [3] CuS, covellite, [2] copper monosulfide; Cu 9 S 8 (Cu 1.12 S), yarrowite [4] Cu 39 S 28 (Cu ...
Copper, a coin of low value, brown- or copper-colored Copper, a shaped ingot or ornamental sheet of the metal used by indigenous tribes of the North American West Coast region in potlatch ceremonies, as a show of wealth (ingot) and as a symbolic representation of a slave (sheet)
The standard atomic weight of a chemical element (symbol A r °(E) for element "E") is the weighted arithmetic mean of the relative isotopic masses of all isotopes of that element weighted by each isotope's abundance on Earth. For example, isotope 63 Cu (A r = 62.929) constitutes 69% of the copper on Earth, the rest being 65 Cu (A r = 64.927), so