31
69.72
Ga
Gallium
Identification
CAS Number: 7440-55-3
Discovery Year: 1875
Discoverer: Paul Émile Lecoq de Boisbaudran
Discovery Location: France
Properties
Atomic Dimensions
Atomic Radius: 130 pm →
Atomic Radius (Rahm): 233 pm
Covalent Radius: 122 pm →Van der Waals Radius: 187 pm
Metallic Radius: 125 pm
Atomic Volume: 11.8 cm³/mol
Lattice Constant: 4.51 Å
Thermodynamics
Electronic Structure
Electron Config: [Ar] 3d10 4s2 4p
Block: p
Period: 4 →Group: 13 →Electronegativity: 1.81 →Electron Affinity: 0.43 eV →Oxidation States: +3
Abundance & Geochemistry
Crust Abundance: 19 mg/kg
Sea Abundance: 0.000029999999999999997 mg/L
Goldschmidt Class: chalcophile
About
Soft silvery metallic element, belongs to group 13 of the periodic table. The two stable isotopes are Ga-69 and Ga-71. Eight radioactive isotopes are known, all having short half-lives. Gallium Arsenide is used as a semiconductor. Corrodes most other metals by diffusing into their lattice. First identified by Francois Lecoq de Boisbaudran in 1875.
Isotopes
Ga-69 69 60.11%
Ga-71 71 39.89%
