Company Name | Cobalt |
---|---|
Website | https://en.wikipedia.org |
Snippet | Cobalt is a chemical element with the symbol Co and atomic number 27. Like nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron.The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.. Cobalt-based blue pigments (cobalt blue) have been used since ancient times for ... |
56Co | syn |
57Co | syn |
58Co | syn |
59Co | 100% |
60Co | syn |
Block | d-block |
Group | group 9 |
P (Pa) | Vapor pressureP (Pa)1101001 k10 k100 kat T (K)179019602165242327553198 |
Period | period 4 |
at T (K) | 1790 |
Isotope | IsotopeAbundanceHalf-life (t1/2)Decay modeProduct56Cosyn77.27 dε56Fe57Cosyn271.74 dε57Fe58Cosyn70.86 dε58Fe59Co100%stable60Cosyn5.2714 yβ−, γ60Ni |
Appearance | hard lustrous bluish gray metal |
CAS Number | 7440-48-4 |
Bulk modulus | 180 GPa |
Phase at STP | solid |
Atomic radius | empirical: 125 pm |
Boiling point | 3200 K (2927 °C, 5301 °F) |
Melting point | 1768 K (1495 °C, 2723 °F) |
Mohs hardness | 5.0 |
Poisson ratio | 0.31 |
Pronunciation | /ˈkoʊbɒlt/ (listen)[1] |
Shear modulus | 75 GPa |
Heat of fusion | 16.06 kJ/mol |
Covalent radius | Low spin: 126±3 pmHigh spin: 150±7 pm |
Young's modulus | 209 GPa |
Brinell hardness | 470–3000 MPa |
Oxidation states | −3, −1, 0, +1, +2, +3, +4, +5[3] (an amphoteric oxide) |
Vickers hardness | 1043 MPa |
Atomic number (Z) | 27 |
Crystal structure | hexagonal close-packed (hcp) |
Electronegativity | Pauling scale: 1.88 |
Magnetic ordering | ferromagnetic |
Thermal expansion | 13.0 µm/(m⋅K) (at 25 °C) |
Natural occurrence | primordial |
Density (near r.t.) | 8.90 g/cm3 |
Electrons per shell | 2, 8, 15, 2 |
Ionization energies | 1st: 760.4 kJ/mol, 2nd: 1648 kJ/mol, 3rd: 3232 kJ/mol, (more) |
Molar heat capacity | 24.81 J/(mol·K) |
Heat of vaporization | 377 kJ/mol |
Thermal conductivity | 100 W/(m⋅K) |
when liquid (at m.p.) | 8.86 g/cm3 |
Electrical resistivity | 62.4 nΩ⋅m (at 20 °C) |
Electron configuration | [Ar] 3d7 4s2 |
Speed of sound thin rod | 4720 m/s (at 20 °C) |
Discovery and first isolation | Georg Brandt (1735) |
Standard atomic weight.mw-parser-output .nobold{font-weight:normal} Ar, std(Co) | 58.933194(3)[2] |
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