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Cobalt,  27Co
Kobalt electrolytic and 1cm3 cube.jpg
General properties
Name, seembol cobalt, Co
Pronunciation /ˈkbɒlt/ KOH-bolt[1]
Appearance haird lustrous gray metal
Cobalt in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Iron (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Copper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Silver (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercury (transeetion metal)
Thallium (post-transeetion metal)
Lead (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)


Atomic nummer 27
Staundart atomic wicht (±) (Ar) 58.933194(4)
Element category   transeetion metal
Group, block group 9, d-block
Period period 4
Electron configuration [Ar] 4s2 3d7
per shell
2, 8, 15, 2
Pheesical properties
metallic gray
Phase solid
Meltin pynt 1768 K ​(1495 °C, ​2723 °F)
Boilin pynt 3200 K ​(2927 °C, ​5301 °F)
Density near r.t. 8.90 g/cm3
when liquid, at m.p. 7.75 g/cm3
Heat o fusion 16.06 kJ/mol
Heat o 377 kJ/mol
Molar heat capacity 24.81 J/(mol·K)
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1790 1960 2165 2423 2755 3198
Atomic properties
Oxidation states 5, 4, 3, 2, 1, -1[2]amphoteric oxide
Electronegativity Pauling scale: 1.88
Atomic radius empirical: 125 pm
Covalent radius 126±3 (law spin), 150±7 (heich spin) pm
Crystal structur hexagonal close-packed (hcp)
Hexagonal close packed crystal structure for cobalt
Speed o soond thin rod 4720 m/s (at 20 °C)
Thermal expansion 13.0 µm/(m·K) (at 25 °C)
Thermal conductivity 100 W/(m·K)
Electrical resistivity 62.4 n Ω·m (at 20 °C)
Magnetic orderin ferromagnetic
Young's modulus 209 GPa
Shear modulus 75 GPa
Bulk modulus 180 GPa
Poisson ratio 0.31
Mohs haurdness 5.0
Vickers haurdness 1043 MPa
Brinell haurdness 700 MPa
CAS Registry Nummer 7440-48-4
Discovery Georg Brandt (1732)
Maist stable isotopes
Main article: Isotopes o cobalt
iso NA hauf-life DM DE (MeV) DP
56Co syn 77.27 d ε 4.566 56Fe
57Co syn 271.79 d ε 0.836 57Fe
58Co syn 70.86 d ε 2.307 58Fe
59Co 100% 59Co is stable wi 32 neutrons
60Co syn 5.2714 y β, γ 2.824 60Ni
· references

Cobalt is a chemical element wi seembol Co an atomic nummer 27. Lik nickel, cobalt in the Yird's crust is foond anly in chemically combined furm, save for smaa deposits foond in alloys o naitural meteoric iron. The free element, produced bi reductive smeltin, is a haird, lustrous, siller-gray metal.

References[eedit | eedit soorce]

  1. Oxford English Dictionary, 2nd Edition 1989.
  2. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. pp. 1117–1119. ISBN 0080379419.