Atomic Element Z = 13 • Post-Transition Metal
Aluminum (Al) — Atomic Data, Electron Shells & Reactions
Aluminum (symbol Al, atomic number 13) has a standard atomic weight of 26.982 u and ground-state configuration [Ne] 3s2 3p1.
Atomic Number (Z)
13
IUPAC Symbol
Al
Standard Atomic Weight
26.982 g/mol
Period / Group / Block
3 / 13 / p-block
Condensed Electron Config
[Ne] 3s2 3p1
Full Subshell Config
1s2 2s2 2p6 3s2 3p1
Principal Shell Occupancy
[2, 8, 3]
Pauling Electronegativity
1.61
First Ionization Energy
578 kJ/mol
Covalent Radius
121 pm
Melting Point
933.47 K (660.32 °C)
Boiling Point
2792 K (2518.85 °C)
Density
2.7 g/cm³
Oxidation States
+3
Al (Z=13) — Valence shell highlighted in vermilion
Interactive Stoichiometry Reactions Involving Aluminum:
Fe2O3 + Al -> Fe + Al2O3
Al + HCl -> AlCl3 + H2