Potassium
| Latin name | Kalium |
| English name | Potassium |
| chemical symbol | K |
| atomic number | 19 |
| relative atomic mass | 39,0983 |
| period | 4 |
| group | I.A |
| classification | alkali metals |
| discovery year | 1807 |
| discoverer | H. Davy |
| melting point [°C] | 63,25 |
| boiling point [°C] | 759,9 |
| critical temperature [°C] | 1950 |
| critical pressure [MPa] | 16 |
| density [g cm-3] | 0,862 |
| density at melting point [g cm-3] | 0,828 |
| electronegativity [Pauling] | 0,82 |
| stand. el. potential [V] | −2,931 |
| oxidation states | I |
| electron configuration | [Ar]4s1 |
| atomic radius [pm] | 243 |
| covalent radius [pm] | 196 |
| specific heat [J g-1K-1] | 0,75 |
| heat of fusion [kJ mol-1] | 2,334 |
| thermal conductivity [W m-1 K-1] | 102,5 |
| el. conductivity [S m-1] | 1,64.107 |
| 1. ionizing potential [eV] | 4,3407 |
| 2. ionizing potential [eV] | 31,625 |
| 3. ionizing potential [eV] | 45,72 |
| Mohs hardness | 0,4 |
| Brinell hardness [MPa] | 0,363 |
| Young's modulus [GPa] | 1,3 |
| state at normal conditions | solid |
Resources
- BARTHELMY, David. Mineral Species containing Potassium. In: Mineralogy database [online]. 2010 [cit. 2012-09-02]. Avalilable from: http://webmineral.com/.../Chem-K.shtml
- HUSTED, Robert; et al. Potassium. In: LOS ALAMOS NATIONAL SECURITY. Los Alamos National Lab [online]. 2011 [cit. 2012-09-02]. Available from: http://periodic.lanl.gov/19.shtml
- JURSÍK, František. Anorganická chemie kovů. 1. vyd. Praha: Vysoká škola chemicko-technologická, 2002. ISBN 80-7080-504-8.
- MELLOR, Joseph. Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 2. Londýn: Longmans, Green & Co., 1922.
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