Cobalt
| Latin name | Cobaltum |
| English name | Cobalt |
| chemical symbol | Co |
| atomic number | 27 |
| relative atomic mass | 59,3332 |
| period | 4 |
| group | VIII.B |
| classification | transition metals |
| discovery year | 1735 |
| discoverer | G. Brandt |
| melting point [°C] | 1495 |
| boiling point [°C] | 2927 |
| density [g cm-3] | 8,9 |
| density at melting point [g cm-3] | 7,75 |
| electronegativity [Pauling] | 1,88 |
| stand. el. potential [V] | -0,28 |
| oxidation states | -I, I, II, III, IV, V |
| electron configuration | [Ar] 3d7 4s2 |
| atomic radius [pm] | 152 |
| covalent radius [pm] | 126 |
| specific heat [J g-1K-1] | 0,42 |
| heat of fusion [kJ mol-1] | 16,19 |
| thermal conductivity [W m-1 K-1] | 100 |
| el. conductivity [S m-1] | 1,7.107 |
| 1. ionizing potential [eV] | 7,881 |
| 2. ionizing potential [eV] | 17,06 |
| 3. ionizing potential [eV] | 33,5 |
| Mohs hardness | 5 |
| Vickers hardness [MPa] | 1043 |
| Brinell hardness [MPa] | 700 |
| shear modulus [GPa] | 75 |
| Young's modulus [GPa] | 209 |
| Curie's point [K] | 1394 |
| state at normal conditions | solid |
Cobalt is a brittle, hard metallic element.
Resources
- BARTHELMY, David. Mineral Species containing Cobalt. In: Mineralogy database [online]. 2010 [cit. 2012-07-22]. Available from: http://webmineral.com/
- HANNIS, Sarah; BIDE, Tom; et al. Cobalt. Keyworth, Nottingham: British Geological Survey, 2009.
- HARRINGTON, Peter. Transition Metals in Total Synthesis. New York: John Wiley & Sons, 1990. ISBN 0-471-61300-2.
- REMY, Heinrich. Anorganická chemie - II. díl. 2. české vydání, dotisk. Praha: SNTL, 1972, s. 304-321
- SHEDD, Kim. Cobalt. In: U.S. GEOLOGICAL SURVEY. Mineral Commodity Summaries [online]. 2013 [cit. 2013-02-15]. Available from: http://minerals.usgs.gov/
- STARÝ, Jaromír; SITENSKÝ, Ivo; HODKOVÁ, Tereza. Surovinové zdroje České republiky - Nerostné suroviny 2011. In: Česká geologická služba. Surovinové zdroje v ČR [online]. 2011 [cit. 2012-07-25]. Available from: http://www.geology.cz/
- YOUNG, Roland. Cobalt. New York: Reinhold Publ. Corp., 1948.
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