| Atomic Number: | 19 |
| Element Symbol: | K |
| Element Name: | Potassium |
| Atomic Weight: | 39.0983 |
| Group Number: | 1 |
| Group Name: | Alkali metal |
| Period Number: | 4 |
| Block: | s-block |
| Ground State Configuration: | [Ar] 4s |
| Ground State Level: | 2S1/2 |
| Standard State: | Solid |
| Common Valences: | 0,1 |
| Bond Length: | 454.4 |
| Atomic Radius Empirical: | 220 |
| Atomic Radius Calculated: | 243 |
| Covalent Radius Empirical: | 196 |
| Vander Waals Radius: | 275 |
| Electron Affinity: | 48.4 |
| First Ionization Energy: | 418.8 |
| Pauling Electronegativity: | 0.82 |
| Sanderson Electronegativity: | 0.45 |
| Allred Rochow Electronegativity: | 0.91 |
| Mulliken Jaffe Electronegativity: | 0.73 |
| Allen Electronegativity: | 0.734 |
| Density Of Solid: | 856 |
| Molar Volume: | 45.94 |
| Velocity Of Sound: | 2000 |
| Rigidity Modulus: | 1.3 |
| Bulk Modulus: | 3.1 |
| Mineral Hardness: | 0.4 |
| Brinell Hardness: | 0.363 |
| Electrical Resistivity: | 7 |
| Melting Point: | 63.38 |
| Boiling Point: | 759 |
| Critical Temperature: | 1950 |
| Thermal Conductivity: | 100 |
| Enthalpy Of Fusion: | 2.33 |
| Enthalpy Of Vaporization: | 76.9 |
| Enthalpy Of Atmization: | 89 |
| Most Common Oxidation Numbers: | 1 |
| Color: | Silvery white |
| Classification: | Metallic |
| Discovered By: | Sir Humphrey Davy |
| Discovered At: | England |
| Discovered When: | 1807 |
| Origin Of Name: | From the English word potash (pot ashes) and the Arabic word qali meaning alkali (the origin of the symbol K comes from the Latin word kalium) |
Calculate the molecular weight of Potassium or molecular weight K.
Also see the full list of chemical elements and atomic weights.