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.
Dysprosium was discovered in 1886 by French chemist Paul Ãmile Ã©mile lecoq De boisbaudran when he separated dysprosium oxide from holmium. Oxide boisbaudran also discovered gallium in 1875 and isolated samarium for the first time in 1879 using fractional. separationaturally occurring dysprosium is a mixture of seven isotopes and they are found in the percentages shown: 156 Dy (0.06%), 158 Dy (0.1%), 160 Dy (2.3%), 161 Dy (18.9%), 162 Dy (25.5%), 163 Dy (24.9%) and 164 Dy (28.2%). The most abundant isotope is 164 Dy at 28.2%.