13Al26.982
Aluminium (Al)
Element 13 Ā· Post-transition metal
Aluminium (Al) is a chemical element with atomic number 13. It is classified as a post-transition metal in period 3, group 13 of the periodic table (the p-block). Its standard atomic weight is 26.982 u and its ground-state electron configuration is [Ne] 3sĀ² 3pĀ¹.
Aluminium facts
| Atomic number (Z) | 13 |
|---|---|
| Symbol | Al |
| Standard atomic weight | 26.982 u |
| Category | Post-transition metal |
| Group | 13 |
| Period | 3 |
| Block | p-block |
| Electron configuration | [Ne] 3sĀ² 3pĀ¹ |
| Electronegativity (Pauling) | 1.61 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 13 / 13 |
| Neutrons (most common isotope, approx.) | 14 |
| Molar mass | 26.982 g/mol |