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.
argon ← potassium → calcium