13 - Aluminium post-transition metal
Discovered by Hans Christian Ørsted in 1827
- Atomic Radius (Å)
Aluminium (or aluminum; see different endings) is a chemical element in the boron group with symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic, ductile metal. Aluminium is the third most abundant element (after oxygen and silicon), and the most abundant metal, in the Earth's crust.
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 3 | 2 in 3s + 1 in 3p |
26.98 u
Atomic Mass
1.8 Å
Atomic Radius
2792 K
Boiling Point
1.21 Å
Covalent Radius
2.7 g/cm³
Density
41.76
Electron Affinity
1.61
Electronegativity
5.99 eV
First Ionization Energy
933.4 K
Melting Point
3
Number of Shells
3
Electron Valency
13
Atomic Number
2, 8, 3
Electron Shell Occupations
0.9 J/(g K)
Specific Heat
