- a rare, steel-gray, trivalent metallic element used in high-temperature thermometers because of its high boiling point (1983°C) and low melting point (30°C). Symbol: Ga; atomic weight: 69.72; atomic number: 31; specific gravity: 5.91 at 20°C.
Origin of gallium
Examples from the Web for gallium
Its salts would be precipitable by barium carbonate; the gallium salts are thrown down by this reagent.
Its specific gravity (and this is very remarkable) would be about 59; gallium has a specific gravity of 593.
Chemical reactions of gallium:—The following are the chief reactions of the salts of gallium when in solution.
Lecoq de Boisbaudran and E. Jungfleisch, on the extraction of gallium from the ores in which it is found associated with indium.
The hypothetical Eka aluminium of Mendelejeff appears therefore to correspond with the gallium of Boisbaudran.
- a silvery metallic element that is liquid for a wide temperature range. It occurs in trace amounts in some ores and is used in high-temperature thermometers and low-melting alloys. Gallium arsenide is a semiconductor. Symbol: Ga; atomic no: 31; atomic wt: 69.723; valency: 2 or 3; relative density: 5.904; melting pt: 29.77°C; boiling pt: 2205°C
Word Origin and History for gallium
metalic element, discovered by spectral lines in 1875 by French chemist Lecoq de Boisbaudran (1838-1912), who named it apparently in honor of his homeland (see Gallic), but it has been suggested that he also punned on his own name (cf. Latin gallus "cock").
- A rare metallic element that is liquid near room temperature and is found as a trace element in coal, bauxite, and other minerals. Atomic number 31.
- A rare, silvery metallic element that is found as a trace element in coal, in bauxite, and in several minerals. It is liquid near room temperature and expands when it solidifies. It is used in thermometers and semiconductors. Atomic number 31; atomic weight 69.72; melting point 29.78°C; boiling point 2,403°C; specific gravity 5.907; valence 2, 3. See Periodic Table.