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nickel

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nickel

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Also known as Ni, element 28, ₂₈Ni

Nickel is a chemical element; it has symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a hard and ductile transition metal. Pure nickel is chemically reactive, but large pieces are slow to react with air under standard conditions because a passivation layer of nickel oxide that prevents further corrosion forms on the surface. Even so, pure native nickel is found in Earth's crust only in tiny amounts, usually in ultramafic rocks, and in the interiors of larger nickel–iron meteorites that were not exposed to oxygen when outside Earth's atm

OverviewAI-generated

Nickel is a chemical element with the symbol Ni and atomic number 28. It has a mass of 58.6934 and an electronegativity of 1.91. The element exhibits oxidation states of -1, 1, 2, and 3, with an ionic radius of 0.69. Its chemical formula is Ni, and it is represented by the Unicode character "鎳".

The substance has a density of 8.90, a melting point of 2831, and a boiling point of 5139. Its vapor pressure is 0. Nickel was discovered in 1751. Safety guidelines include a time-weighted average exposure limit of 1 and an immediately dangerous to life or health level of 10. The NIOSH Pocket Guide ID is "0445".

Synthesized by Vinony from 31 facts across 4 sources: Wikidata, PubChem, PubMed, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.

Chemical data

Formula
Ni
Molecular weight
58.693 g/mol
IUPAC name
nickel
SMILES
[Ni]
InChIKey
PXHVJJICTQNCMI-UHFFFAOYSA-N
Polar surface area
0 Ų
H-bond donors
0
H-bond acceptors
0
Formal charge
0

via PubChem

Research

74,562 papers

via PubMed

~35 min read

Encyclopedic overview

27 sections
Contents
  • Properties
  • Atomic and physical properties
  • Electron configuration dispute
  • Isotopes
  • Occurrence
  • Compounds
  • Nickel(0)
  • Nickel(I)
  • Nickel(II)
  • Nickel(III) and (IV)
  • Hexavalent nickel
  • History
  • Coinage
  • Canada
  • Switzerland
  • United Kingdom
  • United States
  • Current use
  • World production
  • Production
  • Mond process
  • Market value
  • Applications
  • Biological role
  • Toxicity
  • References
  • External links

Nickel is a chemical element; it has symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a hard and ductile transition metal. Pure nickel is chemically reactive, but large pieces are slow to react with air under standard conditions because a passivation layer of nickel oxide that prevents further corrosion forms on the surface. Even so, pure native nickel is found in Earth's crust only in tiny amounts, usually in ultramafic rocks, and in the interiors of larger nickel–iron meteorites that were not exposed to oxygen when outside Earth's atmosphere.

Meteoric nickel is found in combination with iron, a reflection of the origin of those elements as major end products of supernova nucleosynthesis. An iron–nickel mixture is thought to compose Earth's outer and inner cores.

Excerpted from Wikipedia’s “nickel” article, available under the CC BY-SA 4.0 licence.

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