De Boisbaudran, Paul 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 chemist Paul-fimile Lecoq de Boisbaudran... 

Ramsay, W, Paul Emile (dit Francois) Lecoq de Boisbaudran, J. Chem... 

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. 

The most extraordinary of the predictions to be demonstrated was the discovery, in 1875, of gallium. The French chemist Paul Lecoq de Boisbaudran (1838-1912) announced the discovery of the new element, which he named gallium after the Latin name for France, in a letter to the Academic des Sciences.5 Lecoq was unaware of Mendeleev s work on the periodic law at the time, but when Mendeleev read about Lecoq s work, he felt that it was proof of his system. This led to a misunderstanding between Lecoq and Mendeleev, since it seemed at first that Mendeleev was claiming priority of discovery. 

Some of Paul Lecoq de Boisbaudran s contemporaries suggested that he really named the new element after himself, since lecoq ( cockerel ) is gallus in Latin. Boisbaudran denied this charge. 

The element is named using the Latin name Gallia, for France. It was predicted and described in 1863 by Mendeleev as eka-aluminum and discovered in 1875 by Paul Emile (Francois) Lecoq de Boisbaudran (1838-1912) using spectroscopic analysis. He isolated elemental gallium the same year. The... 

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