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27
Co
58.9332
Cobalt |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| Name: Cobalt | Symbol: Co |
| Group: Trans. Met. | Atomic weight: 58.9332 |
| Density @ 293 K: 8.90 g/cm3 | Atomic volume: 6.7 cm3/mol |
| Group: Trans. Met. | Discovered: 1737 |
States
| State (s, l, g): solid | |
| Melting point: 1768 K (1495 oC) | Boiling point: 3200 K (2927 oC) |
| Heat of fusion: 16.190 kJ/mol | Heat of vaporization: 376.50 kJ/mol |
Energies
| 1st ionization energy: 758.4 kJ/mole | |
| Electronegativity: 1.88 | 2nd ionization energy: 1646 kJ/mole |
| Electron affinity: 63.8 kJ/mole | 3rd ionization energy: 3232.2 kJ/mole |
| Specific heat: 0.42 J/gK | Heat atomization: 425 kJ/mole atoms |
Oxidation & Electrons
| Shells: 2,8,15,2 | Electron configuration: [Ar] 3d7 4s2 |
| Minimum oxidation number: -1 | Maximum oxidation number: 5 |
| Min. common oxidation no.: 0 | Max. common oxidation no.: 3 |
Appearance & Characteristics
| Structure: hcp: hexagonal close pkd | Color: bluish-white |
| Uses: magnets, Co glass (blue) | Toxicity: |
| Hardness: mohs | Characteristics: hard |
Reactions
| Reaction with air: mild, w/ht => Co3O4 | |
| Reaction with 6 M HCl: mild, => H2, CoCl2 | Reaction with 6 M HCl: mild, => H2, CoCl2 |
| Reaction with 15 M HNO3: vigorous, => Co(NO3)2, NOx | Reaction with 6 M NaOH: |
Other Forms
| Number of isotopes: 1 | Hydride(s): none |
| Oxide(s): CoO Co3O4 | Chloride(s): CoCl2 |
Radius
| Ionic radius (2- ion): pm | Ionic radius (1- ion): pm |
| Atomic radius: 125 pm | Ionic radius (1+ ion): pm |
| Ionic radius (2+ ion): 83.8 pm | Ionic radius (3+ ion): 71.8 pm |
Conductivity
| Thermal conductivity: 100 J/m-sec-deg | |
| Electrical conductivity: 160.256 1/mohm-cm | Polarizability: 7.5 A^3 |
Abundance
| Source: Co sulfides & arsenides | |
| Rel. abund. solar system: 3.352 log | Abundance earth's crust: 1.4 log |
| cost, pure: 21 $/100g | cost, bulk: $/100g |
