CAS Number7440-26-8
PubChem CIDna
Atomic Radius136
Atomic Volume8.5
Atomic Weight[98]
Boiling Point4,265
Bulk Modulus
CategoryTransition metals
Crystal StructureSimple Hexagonal
Covalent Radius147
Electrical Resistivity
Electron Configuration[Kr] 4d5 5s2
Electrons per shell2, 8, 18, 13, 2
Heat of Fusion23
Heat of Vaporization550
Ionization Potential7.28
Magnetic Ordering
Magnetic Susceptibility
Mass Number43
Melting Point2,157
Atomic Number98
Oxidation States-3, -1, 1, 2, 3, 4, 5, 6, 7
Poisson Ratio
Shear Modulus
Specific Heat Capacity-
Thermal Conductivity0.506
Van der Waals radius
Young's Modulus
Abundance in Earth's crustna
Abundance in Universena
Tc Technetium 43 (98) 7 5 d 43 2172.0 4877.0 [Kr] 4d5 5s2 2 8 18 13 2 11.5 None Silver Hexagonal 1.9 1.51 {"1":"702","2":"1470","3":"2850"} 702 53 156 +7,4,6 1.36 8.5 23.0 502.0 0.24 50.6 1 4.12×1066y BetaDecay Solid, Conductor, TransitionMetal, Metal, Radioactive, Synthetic tek-NEE-shi-em Silvery-gray metal. First synthetically produced element. Added to iron in quantities as low as 55 part-per-million transforms the iron into a corrosion-resistant alloy. Made first by bombarding molybdenum with deuterons (heavy hydrogen) in a cyclotron. 0QBlrGva5YQ Technetium
In 1871, existence of gallium was first predicted by Russian chemist Dmitri Mendeleev and called the element eka-aluminum.

Gallium was discovered spectroscopically by French chemist Paul Emile Lecoq de Boisbaudran in 1875 by its characteristic spectrum in an examination of a sphalerite sample.

Later that year, Lecoq obtained the free metal by electrolysis of its hydroxide in potassium hydroxide solution. From the Latin word Gallia, France; also from Latin, gallus, a translation of Lecoq, a cock 43 1937 Carlo Perrier, Emilio Segre Italy From the Greek word "technikos" meaning "artificial"

Isotopes of Gallium

Standard Atomic Weight


Stable Isotopes

Unstable Isotopes

85Tc 86Tc 87Tc 88Tc 89Tc 90Tc 91Tc 92Tc 93Tc 94Tc 95Tc 96Tc 97Tc 98Tc 99Tc 100Tc 101Tc 102Tc 103Tc 104Tc 105Tc 106Tc 107Tc 108Tc 109Tc 110Tc 111Tc 112Tc 113Tc 114Tc 115Tc 116Tc 117Tc 118Tc

Gallium is considered to be non-toxic
Gallium has a strong tendency to supercool below its melting point / freezing point
Gallium wets glass or porcelain and forms a brilliant mirror when it is painted on glass.

It is widely used in doping semiconductors and producing solid-state devices such as transistors.

Low melting gallium alloys are used in some medical thermometers as non-toxic substitutes for mercury.

Gallium arsenide is capable of converting electricity directly into coherent light.