Sodium (Na)
Sodium (Na) is element 11 of the periodic table, an alkali metal in period 3 and group 1. Its standard atomic weight is 22.98976928, so one mole of sodium atoms has a mass of 22.98976928 g. At room temperature it is a solid; it melts at 97.8 °C and boils at 882.85 °C.
| Atomic number | 11 |
|---|---|
| Symbol | Na |
| Standard atomic weight | 22.98976928 |
| Molar mass | 22.98976928 g/mol |
| Category | Alkali metal |
| Group | 1 |
| Period | 3 |
| Block | s-block |
| Electron configuration | [Ne] 3s1 |
| Oxidation states | +1 |
| Electronegativity (Pauling) | 0.93 |
| Atomic radius (van der Waals) | 227 pm |
| First ionisation energy | 5.139 eV (495.8 kJ/mol) |
| Electron affinity | 0.548 eV |
| State at room temperature | Solid |
| Melting point | 370.95 K (97.8 °C) |
| Boiling point | 1156 K (882.85 °C) |
| Density | 0.97 g/cm³ |
| Discovered | 1807 |
Group 1
Calculate with Sodium
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.