Gallium

Post-transition metal · 69.723 u · group 13, period 4

Gallium · Ga

Atomic number31

SymbolGa

CategoryPost-transition metal

Standard stateSolid

Group · Period · Block13 · 4 · p

Electron configuration[Ar]4s2 3d10 4p1

Atomic mass69.723 u

Atomic radius187 pm

Protons / Neutrons / Electrons31 / 39 / 31

Shells (e⁻ per shell)2, 8, 18, 3

Electronegativity (Pauling)1.81

Ionization energy5.999 eV

Electron affinity0.3 eV

Oxidation states+3

Melting point302.9 K · 29.8 °C

Boiling point2.48e+3 K · 2.20e+3 °C

Density5.91 g/cm³

Year discovered1875

CPK color

#C28F8F

State at room temp (25 °C)

solid

Position