Aluminum

Post-transition metal · 26.981538 u · group 13, period 3

Aluminum · Al

Atomic number13

SymbolAl

CategoryPost-transition metal

Standard stateSolid

Group · Period · Block13 · 3 · p

Electron configuration[Ne]3s2 3p1

Atomic mass26.981538 u

Atomic radius184 pm

Protons / Neutrons / Electrons13 / 14 / 13

Shells (e⁻ per shell)2, 8, 3

Electronegativity (Pauling)1.61

Ionization energy5.986 eV

Electron affinity0.441 eV

Oxidation states+3

Melting point933.4 K · 660.3 °C

Boiling point2.79e+3 K · 2.52e+3 °C

Density2.7 g/cm³

Year discoveredAncient

CPK color

#BFA6A6

State at room temp (25 °C)

solid

Position

2 in library