NO. 031Post-Transition

Ga

Gallium

Gallium is a soft metal that melts in the hand and is used in semiconductors and LEDs.

Crystal Structure

Orthorhombic

Atomic Mass69.72 u

Density5.91 g/cm³

Melting Point303 K

Boiling Point2477 K

Atomic Radius135 pm

Electronegativity1.81

Ionization Energy579 kJ/mol

Electron Affinity29 kJ/mol

Bonding TypeMetallic

Oxidation States3

Acid/BaseCan act as acid or base

ReactivityLow

Electron Configuration

[Ar] 3d10 4s2 4p1

Discovered ByPaul-Émile Lecoq de Boisbaudran

Year1875

Known Isotopes

Ga-69Ga-71