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11
Na
22.990
Sodium
Alkali metals · Group 1 · Period 3
Atomic properties
| Atomic number | 11 |
|---|---|
| Symbol | Na |
| Standard atomic weight | 22.990 |
| Classification | Alkali metals |
| Group | 1 |
| Period | 3 |
| Block | s-block |
| Electron configuration | [Ne] 3s1 |
| Electronegativity (Pauling) | 0.93 |
| Common oxidation states | +1 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 0.968 g/cm³ |
| Melting point | 97.79 °C |
| Boiling point | 883 °C |
| Discovered | 1807 |
| CAS number | — |