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Green solid NiO is the common oxide of nickel. NiO is formed by thermal decomposition of the hydroxide, carbonate, oxalate, or nitrate.

It is the only metal from the first transition elements that form halides in a +2 oxidation state. All four anhydrous halides like NiX2 are known.

Nickel is mainly produced from sulfide ore which contains about 3 percent of Ni, 1.5 percent of copper, and precious metals like gold, silver, and platinum. The main steps for the extraction of metal,

The metal is used for making electrical cells like alkaline Fe-Ni and Cd-Ni cells and gas diffusion electrodes for alkaline fuel cells.

In the 17th century, a mineral had the appearance of a cuprite but could not be melted to obtain copper. Metallurgists decided that the ore was dominated by the evil spirit of the mountain copper devil or Kupfer-nickel.

The ferromagnetic properties and Courie point of cobalt (375 °C) are less than that of cobalt and iron. The compact metal is quite resistant to air and water but strong heating in the air produces little amount of oxide.

The face-centered cubic crystal lattice nickel is a hard silvery metal. It is very malleable and ductile and easily rolled down or polished.

Sometime after, scientists believed that Ni was a mixture of cobalt, iron, arsenic, and copper. The doubts were finally resolved by scientist T Bergmann in 1775.

In the +2 state, nickel forms a wide range of simple compounds like oxide (NiO), hydroxide (NiOH), halides sulfide (NiS), carbonate (NiCO3), cyanide (NiCN), and complex compounds.

The green color nickel hydroxide has the chemical formula Ni(OH)2. The green gel precipitate of Ni(OH)2 is formed by the addition of an alkali metal hydroxide solution to aqueous Ni (II).

A small part of Ni increases the quality of cast iron. For example, 0.25 to 0.45 percent of Ni in steel increases the mechanical properties and corrosion resistance properties.

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Nickel is a chemical element, silvery, malleable, ductile, ferromagnetic transition metal of group 10 of the periodic table with atomic number 28 and symbol Ni. It is used in making alloys with iron and other nonferrous metals like silver and chromium. The valence shell electronic configuration of nickel [Ar] 3d8 4s2 with incomplete d-orbital. Therefore, it commonly shows a +2 oxidation number or state. The compact metal is quite resistant to air or water but finely divided nickel is very reactive and pyrophoric. It is slowly attacked by dilute hydrochloric acid and sulfuric acid but dissolves readily in dilute nitric acid and aqua regia.

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The confusion regarding the mineral persists until 1751. In 1751, Axel Fredrik Cronstedt extracted copper from the copper devil or Kupfer-nickel mineral in Sweden.

The metal is used mainly in the form of alloys like Monel metal, nickel silver, nichrome, alnico with iron, and other nonferrous metals.

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The residue is further reduced with coke which contains 65 percent of Ni, 30 percent of copper, and 3 to 8 percent of sulfur and iron residue.

The common chemical catalyst for this purpose is Raney Nickel. It is a highly active form of the metal prepared by dissolving aluminum from the alloy NiAl3 with alkali.

The transition metal nickel is placed in period-4 and group-10 of the periodic table with other group members palladium and platinum.

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It is the twenty-second most abundant element found in the earth’s crust and the seventh most abundant metal among the transition elements. It is found most often in combination with sulfur, iron, and arsenic in the mineral-like nickeline.

The enzyme is present in a number of plants, eubacteria, archaebacteria, and fungi. The enzyme contains an uncommon oxidation state like +2 with a redox reaction inactive unit containing octahedral Ni which acts as a Lewis acid.

The precipitate turns crystalline on prolonged standing. Ni(OH)2 dissolved readily in acids and ammonia to form soluble complex compounds.

The redox-active nickel centers are present in other enzymes like Hydrogenase, CO dehydrogenase, and methyl-S-coenzyme M reductase found mainly in bacteria.

Indonesia and Australia have the biggest reserves of metal. Garnierite is found in New Caledonia, Cuba, Brazil, and Queensland. The most important single deposit of nickel is found in countries like Sudbury, Canada, Russia, and South Africa.

In the electrolytic refining process, the Ni-Cu mate is roasted in a multiple hearth roaster to form their respective oxides. Most of the copper oxide is leached out with hot dilute sulfuric acid.

The natural biological application of nickel was established only in 1975 with the discovery of the metal in the enzyme jack bean urease.

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It has five naturally occurring isotopes 58Ni, 60Ni, 61Ni, 62Ni, and 64Ni with several radioactive isotopes (atomic mass ranges 48 to 78).

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68 percent of nickel from global production uses for making stainless steel. The metal is used in many industrial and consumer products like stainless steel, magnets, rechargeable batteries, electrical plating, etc.