Skip to content
AIDb
nickel
Image: Wikimedia Commons

nickel

Chemical element with symbol Ni and atomic number 28

Chemical elementchemical elementQ744

Also known as element 28 · ₂₈Ni · Ni

Symbol
Atomic number
  • 28
Mass
Melting point
Boiling point
Density
  • 8.9 g/cm³
Discovered by
Discovered
  • 1751

Overview

All data

350 statements · 14% with external sources · numbers in brackets are citations

Electronegativity
  • 1.91
Oxidation state
  • 2
  • -1
  • 1
  • 3
  • 4
  • -2
  • 0
Subclass of
NIOSH Pocket Guide ID
  • 0445
Has effect
Immediately dangerous to life or health
  • 10 milligram per cubic metre
Vapor pressure
  • 0 millimetre of mercury temperature: 68°F
Time-weighted average exposure limit
  • 0.015 milligram per cubic metre applies to jurisdiction: none · runtime: 10 h
  • 1 milligram per cubic metre applies to jurisdiction: United States · runtime: 8 h
Canonical SMILES
Formula
Subject has role
Named after
Has characteristic
Unicode character
Part of
Found in taxon
Ionic radius
  • 0.49 ångström charge number: 2 · coordination number: 4
  • 0.69 ångström charge number: 2 · coordination number: 6
  • 0.56 ångström charge number: 3 · coordination number: 6
Made from material
Associated hazard
Space group
Crystal system
Bulk modulus
  • 174B Pa
Shear modulus
  • 91.6B Pa
Poisson's ratio
  • 0.276
Thermal conductivity
  • 91 watt per metre kelvin
Electrical conductivity
  • 13.9M siemens per metre
Specific heat capacity
  • 444 joule per kilogram kelvin
Speed of sound
  • 4,970 m/s
Electrical resistivity
  • 6.93e-8 ohm metre
Point group
Standard enthalpy of formation
  • 430.12 kilojoule per mole state of matter: gas
  • 17.48 kilojoule per mole state of matter: liquid
Standard molar entropy
  • 182.19 joule per mole kelvin state of matter: gas
  • 41.49 joule per mole kelvin state of matter: liquid
  • 29.87 joule per mole kelvin state of matter: solid
Mohs' hardness
  • 4
Linear thermal expansion coefficient
  • 12.83 micrometre per metre kelvin temperature: 20°C
Ionization energy
Electron configuration
Atomic radius
  • 135 picometre
Covalent radius
  • 124 picometre

On other databases

100 identifiers linking nickel across the web's reference databases