Potassium (K) — Element 19: Properties & Data | Aladdin Scientific
Potassium(K) — Element 19
Potassium (K) is a alkali metal with atomic number 19 and atomic mass 39.0983. It has melting point 336.53 K (63 °C), boiling point 1032 K (759 °C), density 0.89 g/cm³. It sits in group 1 and period 4 of the periodic table and was discovered in 1807.
Key facts
| Atomic mass | 39.0983 u |
|---|---|
| Electron configuration | [Ar]4s1 |
| Oxidation states | +1 |
| Electronegativity (Pauling) | 0.82 |
| Atomic radius (van der Waals) | 275 pm |
| Ionization energy | 4.341 eV |
| Electron affinity | 0.501 eV |
| Melting point | 336.53 K |
| Boiling point | 1032 K |
| Density | 0.89 g/cm³ |
| Standard state | Solid |
| Year discovered | 1807 |
Frequently asked questions
What is the electron configuration of potassium?
The ground-state electron configuration of potassium is [Ar]4s1.
What group and period is potassium in?
Potassium (K) is in group 1 and period 4 of the periodic table, classified as a alkali metal.
What is the melting point of potassium?
Potassium melts at 336.53 K (63 °C).
What is the standard state of potassium?
Potassium is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .