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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).
At right is displayed the color copper penny. A US 2003 penny featuring Lincoln Copper penny is one of the colors in the special set of metallic Crayola crayons called Silver Swirls , the colors of which were formulated by Crayola in 1990.
Oxygen-free copper is typically specified according to the ASTM/UNS database. [4] The UNS database includes many different compositions of high conductivity electrical copper. Of these, three are widely used and two are considered oxygen-free: C10100 – also known as oxygen-free electronic (OFE). This is a 99.99% pure copper with 0.0005% ...
The modern technique (abbreviation of modern technique of the pistol) is a method for using a handgun for self-defense, originated by firearms expert Jeff Cooper. [1] The modern technique uses a two-handed grip on the pistol and brings the weapon to eye level so that the sights may be used to aim at the target.
Copper(II) sulfate is an inorganic compound with the chemical formula Cu SO 4.It forms hydrates CuSO 4 ·nH 2 O, where n can range from 1 to 7. The pentahydrate (n = 5), a bright blue crystal, is the most commonly encountered hydrate of copper(II) sulfate, [10] while its anhydrous form is white. [11]
The U.S. Institute of Medicine (IOM) sets tolerable upper intake levels (ULs) for vitamins and minerals when evidence is sufficient. In the case of copper the adult UL is set at 10 mg/day.
Copper phthalocyanine is a complex of copper(II) with the conjugate base of phthalocyanine, i.e. Cu 2+ Pc 2−. The description is analogous to that for copper porphyrins, which are also formally derived by double deprotonation of porphyrins. CuPc belongs to the D 4h point group. It is paramagnetic with one unpaired electron per molecule.
Copper(II) fluoride is an inorganic compound with the chemical formula CuF 2. The anhydrous form is a white, ionic, crystalline, hygroscopic salt with a distorted rutile-type crystal structure, similar to other fluorides of chemical formulae MF 2 (where M is a metal). The dihydrate, CuF 2 ·2H 2 O, is blue in colour. [3]