Rubidium's atomic number is 37
Rubidium's atomic mass is 85.4678
Properties of Rubidium are similar to the other alkali metals including rapid oxidation in air.
Rubidium is far too reactive to be found as the free metal in nature.It it relatively rare, although it is the 16th most abundant element in the earth's crust, Rubidium is present in some minerals found in North America, South Africa, Russia, and Canada.
Rubidium is used in vacuum tubes as a getter, a material that combines with and removes trace gases from vacuum tubes. It is also used in the manufacture of photocells and in special glasses. Since it is easily ionized, it might be used as a propellant in ion engines on spacecraft.
Rubidium is a Alkali Metal