Rubidium (Rb), a chemical element of Group 1 (Ia) in the periodic table, an alkali metal group. Rubidium is the second most reactive and very soft metal sequence, with a silvery-white luster. Rubidium was invented (1861) spectroscopically by German scientists Robert Bunsen and Gustav Kirchhoff and named after two prominent red lines of its spectrum. […]
AZ Chemistry