Co - Cobalt
- Atomic Number: 27
- Atomic Weight (Mass): 58.93320
- Melting Point: 1083 °C
- Boiling Point: 2567 °C
- Orbital Class: 3d
- Orbital: [Ar] 3d7 4s2
- Class: Transition Metals
- Electronegativity: 1.8
- Density: 8.9 g.cm-3
- Van der Waals Radius: 200.pm
- Ionic Radius: 0.078 nm (+2), 0.063 nm (+3)
- First Ionization Energy: 760.41 kJ mol-1
- Second Ionization Energy: 1648.27 kJ mol-1
- Third Ionization Energy: 3232.28 kJ mol-1
- Heat of Fusion: 15.2 kJ mol-1
- Heat of Vaporization: 382.4 kJ mol-1
- Heat of Atomization: 423.082 kJ mol-1
- Electrical Conductivity: 6.24 µ Ωcm
- Thermal Conductivity: 100 W m-1 K-1
- Related To: B, Al, Sc, Co, Ni, Ga, Y, Ag, In, La, Nd, Pm, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, Au, Tl, Ac, Cm, Cf, Es, Fm, Md, No, Lr,
Cobalt has a metallic permeability two thirds that of iron. It exists as a mixture of two allotropes over a wide temperature range. The transformation is slow and accounts in part for the wide variation in the physical properties of cobalt. It is alloyed with iron, nickel and other metals to make Alnico, an alloy of unusual magnetic strength with many important uses. Samarium-cobalt is one of the highest strength magnet alloys known. Cobalt compounds produce a brilliant and permanent blue color in ceramic glazes, glass, pottery, tiles, and enamels. Co-60 is useful as a gamma ray source.
fcc of 722 K.
Cobalt is a Block D, Group 9, Period 4 element. The electronic configuration is [Ar] 3d7 4s2. In its elemental form cobalt's CAS number is 7440-48-4. The cobalt atom has a radius of 125.3.pm and it's Van der Waals radius is 200.pm.
Cobalt was first discovered by George Brandt in 1737.
French: Cobalt, German: Cobalt, Italian: cobalto, Portuguese: Cobalto, Spanish: cobalto, Swedish: Kobolt
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Common oxidation states of cobalt include +2 and +3, though +1 is also seen.
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