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On the teacher's blog, on wikipedia, translator and blog "Geografía infinita"

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LIQUID MIRROR!? Metal That Melts In Your Hand!

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Certain compounds of gallium (GaAs and GaP) are good semiconductors and are used in the manufacture of eletronic components

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Gallium is similar that includes aluminium. it is amphoteric, but little more acidic than aluminium. the normal valence of gallium is 3+ formed hydroxides, oxides and dirty there. The gallium melts on contact with the air when heated to 500ºC (930ºF). Reacts vigorously with boiling water, but slightly with water at room tempereture. Dirty gallium is colorless; it is prepared for direct metal manna, since the purification of it is simpler than that of dirt.

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Gallium Chemical element, symbol Ga, atomic number 31 and atomic weight 69.72. It was discovered by Lecoq de Boisbaudran in France in 1875. It has a large temperature range in the liquid state, and its use in high temperature thermometers and manomewters has been recommended.

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Paul-Émile Lecoq de Boisbaudran

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France has two elements related to its territory.The first is the Francium,wich receives this name since it was isolated by the FRENCH MARGUERITE PEREY in 1939 in this country,but also relates to the country of gallium,wich owes its name to the ROMAN denomination of this territory,the galia.However,the story also tells another version,that,lecoq boisbaudran,the Frenchman who isolated the element in 1878,called him Gallium by the French word "GALLUS",rooster "le coq" in French .If true,the name of the element would be directly related to his surname.I surely kill two birds with one stone.

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In 1878 in France.