13Al26.982
Post-Transition Metalp-block
Aluminium
Element 13 on the periodic table, symbol Al, group 13, period 3.
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.
Appearance: silvery gray metallic
Properties
- Atomic Number
- 13
- Atomic Mass
- 26.9815 u
- Group
- 13
- Period
- 3
- Block
- p-block
- Category
- Post-Transition Metal
- State at 25 °C
- Solid
- Melting Point
- 933.5 K · 660.3 °C
- Boiling Point
- 2,743 K · 2,469.9 °C
- Density
- 2.7 g/cm³
- Atomic Radius
- 125 pm
- Electronegativity
- 1.61
- Oxidation States
- +3
- Abundance in Crust
- 8.23e+4 mg/kg
- Discovered
- 1825
- Discovered By
- Unknown
Electron Configuration
[Ne] 3s2 3p1
1s2 2s2 2p6 3s2 3p1
Ionisation Energies (kJ/mol)
- 1. 577.5
- 2. 1,816.7
- 3. 2,744.8
- 4. 11,577
- 5. 14,842
- 6. 18,379
- 7. 23,326
- 8. 27,465
Elements near Aluminium
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.