19 · K
Potassium
Isolated by Davy in 1807.
Identity
- Atomic number
- 19
- Symbol
- K
- Canonical name
- Potassium
- Category
- alkali metal
- Group
- 1
- Period
- 4
- Block
- s
- Other names
- kalium
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- 39.09831 u
- Electron configuration
- [Ar] 4s1
- Electrons per shell
- 2, 8, 8, 1
- Standard state
- solid
- Density
- 0.862 g/cm³
- Melting point
- 336.7 K
- Boiling point
- 1,032 K
- Electronegativity
- 0.82 Pauling
- First ionization energy
- 418.8 kJ/mol
- Electron affinity
- 48.383 kJ/mol
History
Electrolytic isolation
Isolation · confirmed · 1807
Davy isolates potassium by electrolysis of caustic potash.
Etymology
- Theme
- mineral
- Language
- arabe
- Root
- al-qali
- Meaning
- alkali; the symbol comes from kalium
Scientists
Places and institutions
- London — historical setting : United Kingdom — present country : United Kingdom
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements