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13
Al
26.982
Aluminium
Post-transition metals · Group 13 · Period 3
Atomic properties
| Atomic number | 13 |
|---|---|
| Symbol | Al |
| Standard atomic weight | 26.982 |
| Classification | Post-transition metals |
| Group | 13 |
| Period | 3 |
| Block | p-block |
| Electron configuration | [Ne] 3s2 3p1 |
| Electronegativity (Pauling) | 1.61 |
| Common oxidation states | +3 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 2.70 g/cm³ |
| Melting point | 660.32 °C |
| Boiling point | 2470 °C |
| Discovered | 1825 |
| CAS number | — |