Cesium
| Latin name | Caesium |
| English name | Cesium |
| chemical symbol | Cs |
| atomic number | 55 |
| relative atomic mass | 132,90543 |
| period | 6 |
| group | I.A |
| classification | alkali metals |
| discovery year | 1860 |
| discoverer | Bunsen, Kirchhoff |
| melting point [°C] | 28,4 |
| boiling point [°C] | 669,3 |
| critical temperature [°C] | 1665 |
| critical pressure [MPa] | 9,4 |
| density [g cm-3] | 1,873 |
| density at melting point [g cm-3] | 1,843 |
| electronegativity [Pauling] | 0,79 |
| stand. el. potential [V] | −3,026 |
| oxidation states | I |
| electron configuration | [Xe] 6s1 |
| atomic radius [pm] | 298 |
| covalent radius [pm] | 225 |
| specific heat [J g-1K-1] | 0,24 |
| heat of fusion [kJ mol-1] | 2,092 |
| thermal conductivity [W m-1 K-1] | 35,9 |
| el. conductivity [S m-1] | 5,3.106 |
| 1. ionizing potential [eV] | 3,8939 |
| 2. ionizing potential [eV] | 25,10 |
| Mohs hardness | 0,2 |
| Young's modulus [GPa] | 1,7 |
| state at normal conditions | solid |
Cesium is a silvery white to silvery gold metal. It is soft and ductile. Cesium is the most electropositive metal and bonds ionically with a wide variety of anions to form compounds.
Resources
- ANGULO, Marc. Cesium. In: U.S. GEOLOGICAL SURVEY. Mineral Commodity Summaries [online]. 2012 [cit. 2012-08-02]. Available from: http://minerals.usgs.gov/
- BARTHELMY, David. Mineral Species containing Cesium. In: Mineralogy database [online]. 2010 [cit. 2012-06-20]. Available from: http://webmineral.com/
- BUTTERMAN, W; et al. Mineral commodity profiles, Cesium. U.S. DEPARTMENT OF THE INTERIOR, U.S. GEOLOGICAL SURVEY. Open-File Report 2004-1432. Reston, Virginia 2005.
- ITKINA, Lidija. Gidroksidy litija, rubidija i cezija. Moskva: Nauka, 1973.
- JURSÍK, František. Anorganická chemie kovů. 1. vyd. Praha: Vysoká škola chemicko-technologická, 2002. ISBN 80-7080-504-8.
- KOGAN, Boris; et al. Rubidij i cezij. Moskva: Nauka, 1971.
- MELLOR, Joseph. Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 2. Londýn: Longmans, Green & Co., 1922.
- PEREĽMAN, Fania, Moiseevna. Rubidium and caesium. Oxford: Pergamon Press, 1965.
- 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/
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