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- Name : Rubidium
- Symbol : Rb
- Atomic # : 37
- Atom weight: 85.468
- Melting P. : 38.89
- Boiling P. : 686
- Oxidation : +1
- Pronounced : roo-BID-i-em
- From : Latin rubidus, "deep red"
- Identified : Robert Bunsen and Gustav Kirchhoff in 1861
- Appearance : Soft, silvery-white, highly reactive metal
- Note : Used to the manufacture of vacuum and cathode-ray tubes
-
- [Properties]
-
- Rubidium belongs to the family of alkali metals in Group IA of the
- periodic table. As a member of this group, it is highly reactive, it cannot
- exist in its elemental state in nature because it reacts with ordinary air
- and moisture to produce compounds. Rubidium is so reactive, in fact, that
- it undergoes spontaneous combustion when exposed to air at room temperature,
- forming a mixture of its oxides. It also reacts violently with water,
- producing rubidium hydroxide and liberating hydrogen gas that is immediately
- ignited by the heat of the reaction. The pure metal has to be stored and
- transported in containers of kerosene or nitrogen gas, or in a vacuum bottle.
- Rubidium is a very soft, silvery-white metal. Its compounds produce a
- yellow-violet color with subjected to a flame test.
- Because rubidium was considered a very rare element until recently, its
- properties are not as well documented as those of the lighter alkali metals.
-