Potassium |
Symbol | K |
---|---|
Latin name | Kalium |
Atomic number | 19 |
Period | 4 |
Element category | Alkali metals |
Relative atomic mass | 39.0983 |
Group | I.A |
Electronegativity | 0.9 |
Oxidation numbers | 1 |
Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s1 |
Density [g/cm3] | 0.862 |
State | Solid |
Melting point [°C] | 93.65 |
Boiling point [°C] | 760 |
Critical point [°C] | 1950 |
Critical pressure [MPa] | 16 |
Atomic radius [pm] | 243 |
Covalent radius [pm] | 196 |
Thermal conductivity [W m-1K-1] | 102.5 |
Heat capacity [J K-1g-1] | 0.757 |
Discovery | 1807 |
Hardness [Mohs scale] | 0.5 |
Brinell hardness [MPa] | 0.363 |
Electrical conductivity [S m-1] | 1.64 · 107 |
1.st ionization energy [eV] | 4.3407 |
2.nd ionization energy [eV] | 31.625 |
3.rd ionization energy [eV] | 45.72 |
Stable isotopes | 3 |
Unstable isotopes | 8 |