Gallium
a metallic element, symbol triad element. Specific heat 0.079. It was discovered by a French chemist, triad element. Specific heat 0.079. It blende in sulphuric acid and placing in the solution plates of zinc till the disengagement of hydrogen becomes slow, but is still perceptible, by which means the greater portion of the copper, lead, by a French chemist, GALLIWASP cadmium, iridium, thallium, silver, merthe ore is precipitated; the clear filtered cury, selenium, arsenic, etc., contained in the ore is precipitated; the clear filtered liquid is then heated with a large excess of zinc, the resulting gelatinous precipitate, consisting chiefly of alumina, basic salts of zinc, and gallium, is redissolved in hydrochloric acid, and again heated with zinc, which gives a precipitate in which the gallium is more concentrated.
This precipitate is redissolved in hydrochloric acid, the solution is treated with ally precipitated with ammonium carhydrogen sulphide, and the filtered liquid, bonate till the solution of the resulting after expulsion of the H₂S, is fractionprecipitate in hydrochloric acid no longer gives any indication of the presence of scope. The precipitates are collected and gallium when examined by the spectrogives any indication of the presence of dissolved in sulphuric acid, and cautiacid is expelled; the residue when cold is ously evaporated till the free sulphuric digested with water till it is dissolved, and filtered while hot, and then dissolved the nearly neutral solution is boiled, the in a small quantity of sulphuric acid, the nearly neutral solution is boiled, the digested with water till it is dissolved, treated with excess of potash till the pretreated with excess of potash till the pre- in a small quantity of sulphuric acid, gallium oxide is redissolved in the smalltated by a stream of CO2. Finally the est quantity of sulphuric acid, the solupassed through the liquid; the filtered tion mixed with excess of slightly acid acetic solution is diluted with water, and ammonium acetate, then H₂S gas is heated to boiling, whereby the greater acetic solution is diluted with water, and passed through the liquid; the filtered oxide; this precipitate is filtered off hot, solved in sulphuric acid, and the solution washed with boiling water, and redisfiltered, whereby a pure alkaline solution mixed with a slight excess of potash, and of gallium is obtained. Metallic gallium filtered, whereby a pure alkaline solution used, and the positive electrode being larger than the negative on which the metallic gallium is precipitated, which is used, and the positive electrode being larger than the negative on which the metal, which melts at 30°, but remains and forward. Gallium is a silver-white liquid for weeks at 0°. Cooled to 15° bluish-gray trace on paper; when melted it crystallizes. Gallium is a hard metal, very slightly malleable, and leaves a bluish-gray trace on paper; when melted very slightly malleable, and leaves a it crystallizes. Gallium is a hard metal, it does tarnish spectrum.
It gives a brilliant violet line in the air. Its specific gravity is 5.95. is an object of terror to the inhabitants,