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Rubidium

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Rubidium
Rubidium
Identification
Symbol
Rb
Block
s-Block
Group
1
Period
5
Atomic Information
Atomic Number
37
Atomic Radius
248 pm
Mass
85.46
Category
Standard state(298 K)
Solid
Electronic Configuration
Not given
Electronegativity (Pauling)
Unknown
Unknown
First ionisation energy
Unknown
Physical Properties
Color
Silvery white
Melting Point
312.46 K
Boiling Point
961 K
Density of solid
Unknown
Unknown
Heat Properties
Enthalpy of fusion
Unknown
Enthalpy of atomisation
Unknown
Enthalpy of vaporisation
Unknown

Rubidium is a soft, silvery-white metallic element of the alkali metals group (Group 1). It is one of the most most electropositive and alkaline elements. It ignites spontaneously in air and reacts violently with water, setting fire to the liberated hydrogen. As so with all the other alkali metals, it forms amalgams with mercury. It alloys with gold, caesium, sodium, and potassium. It colours a flame yellowish-violet.

Historical information

Rubidium was discovered by Robert Bunsen, Gustav Kirchhoff in 1861 at Germany. Rubidium was discovered in 1861 spectroscopically by Robert Bunsen and Gustav Kirchoff as an impurity associated with samples of the mineral lepidolite (a form of mica). The name rubidium (from the Latin "rubidus" - dark red) was coined for its bright red spectroscopic lines.

Rubidium salts were isolated by Bunsen by precipitation from spring waters - along with salts of other Group 1 elements. He was able to separate them and isolated the chloride and the carbonate. He isolated rubidium metal by reducing rubidium hydrogen tartrate with carbon.

Compounds

Hydride

  • Rubidium hydride

Halides

  • Rubidium fluoride
  • Rubidium iodide

Oxides

  • Dirubidium oxide:
  • Rubidium superoxide
  • Dirubidium peroxide

Sulfides

  • Dirubidium sulphide
  • Dirubidium disulphide
  • Dirubidium trisulphide
  • Dirubidium hexaasulphide
  • Dirubidium pentasulphide

Notes Sources

  • NCERT Textbook
  • Webelements.com

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