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Cobalt


4
27
58.9332
KEY
Chemical Element Symbol Key

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Cobalt
Columbia Encyclopedia
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Symbol: Co
Atomic Number: 27
Atomic Weight: 58.9332
Element Classification: Transition Metal
Discovered By: George Brandt
Discovery Date: 1739 (Sweden)
Name Origin: German: kobold (goblin).
Density (g/cc): 8.9
Melting Point (K): 1768
Boiling Point (K): 3143
Appearance: Hard, ductile, lustrous bluish-gray metal
Atomic Radius (pm): 125
Atomic Volume (cc/mol): 6.7
Covalent Radius (pm): 116
Ionic Radius: 63 (+3e) 72 (+2e)
Specific Heat (@20°C J/g mol): 0.456
Fusion Heat (kJ/mol): 15.48
Evaporation Heat (kJ/mol): 389.1
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): 385.00
Pauling Negativity Number: 1.88
First Ionizing Energy (kJ/mol): 758.1
Oxidation States: 3, 2, 0, -1
Electronic Configuration: [Ar] 3d7 4s2
Lattice Structure: Hexagonal (HEX
Lattice Constant (Å): 2.510
Lattice C/A Ratio: n/a


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