Aluminium (Al)
Aluminium
Aluminium (Al) is a post-transition metal in period 3, group 13. Its relative atomic mass is 26.982 and the molar mass of the atom is 26.982 g/mol.
Atomic number 13
Atomic mass 26.982
Molar mass 26.982 g/mol
Category Post-transition metal Solid
Properties of aluminium
| Atomic number | 13 |
|---|---|
| Symbol | Al |
| Latin name | Aluminium |
| Relative atomic mass | 26.982 |
| Molar mass | 26.982 g/mol |
| Group, period, block | 13, 3, p |
| Category | Post-transition metal |
| State at 20 °C | Solid |
| Electron configuration | [Ne] 3s² 3p¹ |
| Electronegativity (Pauling) | 1.61 |
| Atomic radius | 125 pm |
Electron configuration of aluminium
Electrons per shell
K2L8M3
Full notation
1s² 2s² 2p⁶ 3s² 3p¹
Noble-gas notation
13 protons · 13 electrons[Ne] 3s² 3p¹
Formula and compounds of aluminium
Simple substanceAlaluminiumMolar mass of Al: 26.982 g/mol
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Frequently asked questions
The relative atomic mass of aluminium is 26.982, so the molar mass of the atom is 26.982 g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p¹. Noble-gas notation: [Ne] 3s² 3p¹.