Devolution is the. a. passing of authority from the national government to the state and local levels. b. expansion of national authority that began in the 1930s. c. contraction of state authority and the expansion of local government authority.
Hello, There you go. The French chemist Paul-Emile Lecoq de Boisbaudran (1838â1912), who discovered it in 1875. Gallium (Latin Gallia meaning Gaul; also gallus, meaning rooster) was discovered spectroscopically by Lecoq de Boisbaudran in 1875 by its characteristic spectrum (two violet lines) in an examination of a zinc blende from the Pyrenees.
In 1878 Swiss chemists Marc Delafontaine and Jacques-Louis Soret observed previously unrecorded spectroscopic lines. They announced the discovery of element âXâ â the element we now call holmium. (1). In 1879 Per Teodor Cleve in Sweden discovered two new materials â one brown and one green â while working with erbia (erbium oxide). The brown substance he named holmia, which he later found to be holmium oxide, and the green substance he named thulia, which is thulium oxide. (2), (2a). Holmium oxide was isolated in 1886 by French chemist Paul Lecoq de Boisbaudran by fractional precipitation.