Ga

Gallium

Identification

CAS Number: 7440-55-3

Discovery Year: 1875

Discoverer: Paul Émile Lecoq de Boisbaudran

Discovery Location: France

Properties

Atomic Mass: 69.723 →Density: 5.91 g/cm³ →

Crust Abundance: 19 mg/kg

Crystal Structure: ORC

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

Melting Point: 302.93 K →Boiling Point: 2676 K →Specific Heat: 0.372 J/(g·K) →Thermal Conductivity: 28.1 W/(m·K) →Heat of Fusion: 5.59 kJ/mol →Heat of Vaporization: 270.3 kJ/mol →

Heat of Formation: 271.96 kJ/mol

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%