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Periodic table / Other metals

13Aluminium

Aluminium is an other metal in group 13, period 3. At 25 °C it is a solid.

Al
Shells: 2, 8, 3. A simple picture: electrons do not move in circles.
Symbol
Al
Atomic number
13 protons in the nucleus
Standard atomic weight
26.982 ± 0.001
Electron configuration
[Ne] 3s2 3p1
Electrons in each shell
2, 8, 3
Group, period, block
13, 3, p
Family
Other metals
State at 25 °C
solid
Electronegativity
1.61 (Pauling scale)
First ionisation energy
577.5 kJ/mol (5.985769 eV)
Where these numbers come from

Atomic weight: IUPAC CIAAW, abridged standard atomic weights 2024. Electron configuration and ionisation energy: NIST Atomic Spectra Database. Family, state and electronegativity: PubChem. See Sources. Melting points, boiling points and densities are left out for now: published values differ between sources, and we will add them once each has been checked.