Boisbaudran, Paul-Emile Lecoq

Samarium (Sm, [Xe]4/66.r). Name and symbol after the mineral samarskite. Discovered (1879) by Paul Emile Lecoq de Boisbaudran. 

Gadolinium - the atomic number is 64 and the chemical symbol is Gd. The name derives from the mineral gadolinite, in which it was found, and which had been named for the Finnish rare earth chemist Johan Gadolin . It was discovered by the Swiss chemist Jean-Charles Galissard de Marignac in 1886, who produced a white oxide he called Y in a samarskite mineral. In 1886, the French chemist Paul-Emile Lecoq de Boisbaudran gave the name gadolinium to Y . 

Gallium - the atomic number is 31 and the chemical symbol is Ga. The name derives from the Latin gallia for France or perhaps from the Latin gallus for le coq or cock , since it was discovered in zinc blende by the French chemist Paul-Emile Lecoq de Boisbaudan in 1875. It was first isolated in 1878 by Lecoq de Boisbaudran and the French chemist Emile-Clement Jungflesch. This element had previously been predicted as eka-aluminum by Mendeleev, along with its properties and its location in the Periodic Table. 

Dysprosium was first discovered in 1886 by the chemist, Paul-Emile Lecoq de Boisbaudran (1838-1912) as he analyzed a sample of the newly discovered erbium oxide (element 68). Boisbaudran was able to separate erbium oxide from a small sample of a new oxide of a metal. He identified this new element as element 66 on the periodic table and called it dispro-... 

French chemists Jean de Marignac and Paul-Emile Lecoq de Boisbaudran... 

Paris by the French scientist Paul-Emile Lecoq de Boisbaudran. Its isolation was made possible by the development of ion-exchange separation in the 1950s. Dysprosium belongs to a series of elements called rare earths, lanthanides, or 4f elements. The occurrence of dysprosium is low 4.5 ppm (parts per million), that is, 4.5 grams per metric ton in Earth s crust, and 2 x 10 7 ppm in seawater. Two minerals that contain many of the rare earth elements (including dysprosium) are commercially important mon-azite (found in Australia, Brazil, India, Malaysia, and South Africa) and bast-nasite (found in China and the United States). As a metal, dysprosium is reactive and yields easily oxides or salts of its triply oxidized form (Dy3+ ion). 

Gallium was discovered in 1875 by Paul-Emile Lecoq de Boisbaudran at Paris, France, when he examined the spectrum of a zinc sulfide ore from the Pyrenees and saw a faint blue-violet line which told him a new element was present. Its existence had already been predicted six years earlier by the Russian chemist Dimitri Mendeleyev, the man who drew up the first periodic table and saw there was a missing element below aluminium in his group III. 

Using Mendeleev s periodic law, the element was soon found. It was discovered by French chemist Paul-emile Lecoq de Boisbaudran in 1875. 

The discovery of samarium grew out of this kind of frustration. In 1880, French chemist Paul-emile Lecoq de Boisbaudran (1838—1912) was studying a substance known as didymium. Earlier chemists believed didymium might be a new element. Boisbaudran said that at least two new elements were present in didymium. 

Paul-Emile Lecoq de Boisbaudran discovers gallium. 

Table 1. Eka aluminum was predicted by Mendeleev and discovered by the French chemist Paul-Emile Lecoq de Boisbaudran in 1875 and named gallium.

Other chemists began to make use of this new tool. One of them was the French chemist Paul Emile Lecoq de Boisbaudran (1838-1912), who spent fifteen years studying the minerals of his native Pyrenees by means of the spectroscope. In 1875, he tracked down some unknown lines and found a new element in zinc ore. He named it gallium, for Gaul (France). 

Paul Emile Lecoq de Boisbaudran was born in 1838 in Cognac, the son of a wine merchant. He started to work in the family enterprise and remained a wine merchant until the end of his life, he was occupied with chemistry and within its frame above all with spectral analysis as a hobby in his own laboratory. He became an authority in this field, in his book Spectres lumineux (1874) he presented the results of analyzing 35 elements, giving their characteristic lines. In 1875, he discovered gallium in a zinc ore from the Pyrenees which proved to be the eka-aluminium predicted by Mendeleev and was the first proof of the reality of the periodic table and of the predictions of as yet unknown elements by Mendeleev. Lecoq de Boisbaudran died in 1912 in Paris (Ramsay 1913). 

Swedish chemist Lars Nilson discovers the element scandium. French chemist Paul-Emile Lecoq de Boisbaudran discovers the element samarium. Swedish chemist Per Theodor Cleve discovers the element thulium. 

Discovery Paul-Emile Lecoq de Boisbaudran in Paris discovered a new element in didymium in 1879. He gave it the name samarium after the mineral samarskite. 

Discovery Paul-Emile Lecoq de Boisbaudran in France in 1886 found a new element in the REM holmium, earlier discovered by Cleve. The discovery was hard work (dysprositos in Creek), so the new element was given the name dysprosium. 

Discovery In 1875 Paul-Emile Lecoq de Boisbaudran in Paris found the new element gallium. After the discovery it was shown that gallium is Mendelev s eka-aluminum. 

Paul-Emile Lecoq de Boisbaudran (1838-1912) in Paris was tlie very first to confirm Mendeleev s system when in 1875 he identified eka-aluminum and named itgallium. Lecoq also discovered the rare-earth metals samarium and dysprosium. His background, both genealogical and scientific, is described in Chapter 17 Rare earths. 

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