
It can form alloys with the gold, other alkaline metals, and alcalinotérreos, antimony and bismuth.
The rubidio (of the Latin rubidus, blond) was discovered in 1861 by Robert Bunsen and Gustav Kirchhoff in the lepidolita using a spectroscope on having detected both red stripes typical of the spectrum of emission of this element and that are the reason of his name.
This element started being used in photoelectric cells.