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Gallium

Metalsolid
Symbol: Ga
Atomic number: 31
Atomic mass: 69.723
Group: Metal
CAS-number: 7440-55-3

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Physical data
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 3
Orbitals: [Ar] 3d10 4s2 4p1
Electronegativity: 1.6, 1.8
1. Ionization potential: 5.9993 eV
2. Ionization potential: 20.51 eV
3. Ionization potential: 30.71 eV
Oxidation states: 3
Electrical conductivity: 0.0678 10^6
Melting point: 29.78 °C
Boiling point: 2204 °C
Specific heat: 0.37 J/gK
Heat of fusion: 5.590 kJ/mol
Heat of vaporization: 258.70 kJ/mol
Thermal conductivity: 0.406 W/cmK
Atomic radius: 1.81 Å
Ionic radius: 0.62 Å (+3)
Covalent radius: 1.26 Å
Atomic volume: 11.8 cm³/mol
Density (293 K): 5.907 g/cm³
Crystal structure: orthorhombic
orthorhombic

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
66Ga 0 66 0 9.5h β+, EC View
67Ga 0 67 3/2 3.260d EC View
68Ga 0 67.928 1 1.130h β+, EC View
69Ga 60.4 68.9256 3/2 -- --
71Ga 39.6 70.9247 3/2 -- --
72Ga 0 72 3 14.10h β- View

Other info

Name origin:Latin: Gallia (France)
Description:Soft, blue-white metal.
Discovered by:Paul Émile Lecoq de Boisbaudran
Year:1875
Place:France
Sources:Found throughout the earth crust in minerals like bauxite, germanite and coal.
Use(s):Used in semiconductor production. It us used in making LEDs (light-emitting diodes) and GaAs laser diodes.