Nickel
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 Widmanstätten pattern showing the two forms of nickel-iron, Kamacite and Taenite, in an octahedrite meteorite |
Nickel ( ) is a chemical element with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel belongs to the transition metals and is hard and ductile. Pure nickel shows a significant chemical activity that can be observed when nickel is powdered to maximize the exposed surface area on which reactions can occur, but larger pieces of the metal are slow to react with air at ambient conditions due to the formation of a protective oxide surface. Even then, nickel is reactive enough with oxygen so that native nickel is rarely found on Earth's surface, being mostly confined to the interiors of larger nickel–iron meteorites that were protected from oxidation during their time in space. On Earth, such native nickel is always found in combination with iron, a reflection of those elements' origin as major end products of supernova nucleosynthesis. An iron–nickel mixture is thought to compose Earth's inner core.
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- Related: Nickel aluminide, Raney nickel, Superalloy
| An occupational hygiene assessment of dermal nicke... An occupational hygiene assessment of dermal nickel exposures in primary production industries www.iom-world.org/pubs/IOM_TM0405.pdf - Web |
| An occupational hygiene assessment of dermal nicke... An occupational hygiene assessment of dermal nickel exposures in primary production and primary user industries. Phase 2 Report www.iom-world.org/pubs/IOM_TM0506.pdf - Web |
| Norilsk Nickel, Norilsk, Russia Norilsk Nickel, Norilsk, Russia www.nornik.ru/en/ - Web |
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| Vale Nickel, Sudbury, Ontario, Canada (formerly kn... Vale Nickel, Sudbury, Ontario, Canada (formerly known as INCO) nickel.vale.com/countries/canada/sudbury/default.aspx - Web |
| Xstrata Nickel, Sudbury Operations (formerly known... Xstrata Nickel, Sudbury Operations (formerly known as Falconbridge) www.xstratanickel.com/.../SudburyOperations.aspx - Web |
