13Solid
Al 26.982 Atomic mass · uPost-transition metals
Aluminum
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.
Discovery Ancient
K2L8M3
Physical properties
Values for the element in its standard state.
- Density
- 2.7g/cm³
- Melting point
- 933K
- Boiling point
- 2,792K
- Atomic radius
- 118pm
- Bonding type
- Metallic
- Molar heat
- 24.2J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 1 electrons;
[Ne] represents 10 core electrons. The full view shows them explicitly.
13 electrons Orbital order preserved from source
- Electronegativity
- 1.61Pauling scale
- First ionization energy
- 578kJ/mol
- Electron affinity
- 43kJ/mol
- Van der Waals radius
- Not available
Al AluminumAtomic number 13
578kJ/mol
Atomic numberGaps indicate unavailable data
About aluminum
- Appearance
- Silvery gray metallic
- Discovery
- Ancient
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.