Template:Infobox cobalt

Cobalt, 27Co
cobalt chips
Cobalt
Pronunciation/ˈkoʊbɒlt/ ⓘ[1]
AppearanceHard lustrous bluish gray metal
Standard atomic weight Ar°(Co)
Cobalt in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
–
↑
Co
↓
Rh
iron ← cobalt → nickel
Atomic number (Z)27
Groupgroup 9
Periodperiod 4
Block  d-block
Electron configuration[Ar] 3d7 4s2
Electrons per shell2, 8, 15, 2
Physical properties
Phase at STPsolid
Melting point1768 K ​(1495 °C, ​2723 °F)
Boiling point3200 K ​(2927 °C, ​5301 °F)
Density (at 20° C)8.834 g/cm3 [4]
when liquid (at m.p.)7.75 g/cm3
Heat of fusion16.06 kJ/mol
Heat of vaporization377 kJ/mol
Molar heat capacity24.81 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1790 1960 2165 2423 2755 3198
Atomic properties
Oxidation statescommon: +2, +3
−3,? −1,[5] 0,? +1,[5] +4,[5] +5[6]
ElectronegativityPauling scale: 1.88
Ionization energies
  • 1st: 760.4 kJ/mol
  • 2nd: 1648 kJ/mol
  • 3rd: 3232 kJ/mol
  • (more)
Atomic radiusempirical: 125 pm
Covalent radiusLow spin: 126±3 pm
High spin: 150±7 pm
Color lines in a spectral range
Spectral lines of cobalt
Other properties
Natural occurrenceprimordial
Crystal structure ​hexagonal close-packed (hcp) (hP2)
Lattice constants
Hexagonal close packed crystal structure for cobalt
a = 250.71 pm
c = 407.00 pm (at 20 °C)[4]
Thermal expansion12.9×10−6/K (at 20 °C)[a]
Thermal conductivity100 W/(m⋅K)
Electrical resistivity62.4 nΩ⋅m (at 20 °C)
Magnetic orderingFerromagnetic
Young's modulus209 GPa
Shear modulus75 GPa
Bulk modulus180 GPa
Speed of sound thin rod4720 m/s (at 20 °C)
Poisson ratio0.31
Mohs hardness5.0
Vickers hardness1043 MPa
Brinell hardness470–3000 MPa
CAS Number7440-48-4
History
Discovery and first isolationGeorg Brandt (1735)
Isotopes of cobalt
Main isotopes[7] Decay
abun­dance half-life (t1/2) mode pro­duct
56Co synth 77.236 d β+ 56Fe
57Co synth 271.811 d ε 57Fe
58Co synth 70.844 d β+ 58Fe
59Co 100% stable
60Co trace 5.2714 y β−100% 60Ni
 Category: Cobalt
| references
Co · Cobalt
Fe ←

ibox Fe

iso
27 Co  [e]
IB-Co [e]
IBisos [e]
 → Ni

ibox Ni

indexes by PT (page)
child table, as reused in {IB-Co}
Main isotopes of cobalt
Main isotopes[7] Decay
abun­dance half-life (t1/2) mode pro­duct
56Co synth 77.236 d β+ 56Fe
57Co synth 271.811 d ε 57Fe
58Co synth 70.844 d β+ 58Fe
59Co 100% stable
60Co trace 5.2714 y β−100% 60Ni
Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt)
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
  most stable isotope
Wikidata
Wikidata *
* Not used in {{Infobox element}} (2023-01-01)
See also {{Index of data sets}} · Cat:data sets (46) · (this table:
)
  1. ^ "cobalt". Oxford English Dictionary (2nd ed.). Oxford University Press. 1989.
  2. ^ "Standard Atomic Weights: Cobalt". CIAAW. 2017.
  3. ^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
  4. ^ a b Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.
  5. ^ a b c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 28. ISBN 978-0-08-037941-8.
  6. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 1117–1119. ISBN 978-0-08-037941-8.
  7. ^ a b Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.


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