Overview

nickel


Show Summary Details

Quick Reference

Symbol Ni. A malleable ductile silvery metallic transition element; a.n. 28; r.a.m. 58.70; r.d. 8.9; m.p. 1450°C; b.p. 2732°C. It is found in the minerals pentlandite (NiS), pyrrhoite (Fe,Ni)S), and garnierite ((Ni,Mg)6(OH)6Si4O11.H2O). Nickel is also present in certain iron meteorites (up to 20%). The metal is extracted by roasting the ore to give the oxide, followed by reduction with carbon monoxide and purification by the Mond process. Alternatively electolysis is used. Nickel metal is used in special steels, in Invar, and, being ferromagnetic, in magnetic alloys, such as Mumetal. It is also an effective catalyst, particularly for hydrogenation reactions (see also Raney nickel). The main compounds are formed with nickel in the +2 oxidation state; the +3 state also exists (e.g. the black oxide, Ni2O3). Nickel was discovered by Axel Cronstedt (1722–65) in 1751.

http://www.webelements.com/webelements/elements/text/Ni/key.htm Information from the WebElements site

Subjects: Chemistry.


Reference entries

See all related reference entries in Oxford Index »


Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.