Sodium (Na) — Element 11: Properties & Data | Aladdin Scientific
Sodium(Na) — Element 11
Sodium (Na) is a alkali metal with atomic number 11 and atomic mass 22.9898. It has melting point 370.95 K (98 °C), boiling point 1156 K (883 °C), density 0.97 g/cm³. It sits in group 1 and period 3 of the periodic table and was discovered in 1807.
Key facts
| Atomic mass | 22.9898 u |
|---|---|
| Electron configuration | [Ne]3s1 |
| Oxidation states | +1 |
| Electronegativity (Pauling) | 0.93 |
| Atomic radius (van der Waals) | 227 pm |
| Ionization energy | 5.139 eV |
| Electron affinity | 0.548 eV |
| Melting point | 370.95 K |
| Boiling point | 1156 K |
| Density | 0.97 g/cm³ |
| Standard state | Solid |
| Year discovered | 1807 |
Frequently asked questions
What is the electron configuration of sodium?
The ground-state electron configuration of sodium is [Ne]3s1.
What group and period is sodium in?
Sodium (Na) is in group 1 and period 3 of the periodic table, classified as a alkali metal.
What is the melting point of sodium?
Sodium melts at 370.95 K (98 °C).
What is the standard state of sodium?
Sodium 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: .