Aluminum

Document v1 · published by Koskamo · updated 2026-10-04

Aluminum (Al) is chemical element 13, a post-transition metal in group 13, period 3 (PubChem).

Atomic number: 13
Symbol: Al
Group: 13
Period: 3
Atomic mass: 26.981538 u
Electron configuration: [Ne]3s2 3p1
Electronegativity (Pauling scale): 1.61
Atomic radius (van der Waals): 184 pm
Ionization energy: 5.986 eV
Electron affinity: 0.441 eV
Oxidation states: +3
Standard state: Solid
Melting point: 933.437 K
Boiling point: 2792 K
Density: 2.70 g/cm³
Chemical group: Post-transition metal
Year discovered: Ancient

Source and provenance

Original source: pubchem.ncbi.nlm.nih.gov
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: PubChem periodic table data (NIH/NLM, pubchem.ncbi.nlm.nih.gov/ptable); group and period from Jefferson Lab via PubChem

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Version history

Published by Koskamo2026-10-04
Version 1