Gallium

4 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Gallium \Gal"li*um\, n. [NL.; perh. fr. L. Gallia France.]
     (Chem.)
     A rare metallic element, found combined in certain zinc ores.
     It is white, hard, and malleable, resembling aluminium, and
     remarkable for its low melting point (86[deg] F., 30[deg]
     C.). Symbol, Ga; at. wt., 69.9. Gallium is chiefly trivalent,


     resembling aluminium and indium. It was predicted with most
     of its properties, under the name eka-aluminium, by the
     Russian chemist Mendelyeev on the basis of the periodic law.
     This prediction was verified in its discovery (in 1875) by
     the French chemist Lecoq de Boisbaudran by its characteristic
     spectrum (two violet lines), in an examination of a zinc
     blende from the Pyrenees.
     [Webster 1913 Suppl.]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Ekaluminium \Ek*al`u*min"i*um\, n. [Skr. [=e]ka one + E.
     aluminium.] (Chem.)
     The name given by Mendeleev to a hypothetical element, --
     later discovered and called {gallium}. See {Gallium}, and cf.
     {Ekabor}. Also see {periodic table}.
     [1913 Webster +PJC]

From WordNet (r) 2.0 [wn]:

  gallium
       n : a rare silvery (usually trivalent) metallic element; brittle
           at low temperatures but liquid above room temperature;
           occurs in trace amounts in bauxite and zinc ores [syn: {Ga},
            {atomic number 31}]

From Elements database 20001107 [elements]:

  gallium
  Symbol: Ga
  Atomic number: 31
  Atomic weight: 69.72
  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.