Rubidium - ASCII Periodic Table of the Elements

ASCII PERIODIC TABLE OF THE ELEMENTS

  Rb

Relative atomic mass: 85.4678 ± 0.0003

English: Rubidium
French: Rubidium
Croatian: Rubidij
German: Rubidium
Italian: Rubidio
Spanish: Rubidio

Atomic number: 37
Group numbers: 1
Period: 5
Standard state (20 °C): solid

Discovery: 1861 Robert Wilhelm Bunsen, Gustav Robert Kirchhoff (DE)

Rubidium was discovered by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff (DE) in 1861. The origin of the name comes from the Latin word 'rubidius' meaning 'dark red' or 'deepest red'. It is a soft, silvery-white, highly reactive metal that ignites in air and reacts violently with water or oxidants. Rubidium occurs abundantly, but so widespread that production is limited. It is usually obtained from lithium production. It is used in photocells, cathode-ray and vacuum tubes, and as a catalyst.

Electronic configuration: [Kr] 5s¹
Formal oxidation number: +1
Atomic radius: 247.5 pm

Electronegativities: 0.82
Thermal conductivity: 52.8 W/(m K)
Electrical resistivity (20 °C): 12.5 μΩcm

Melting point: 39.31 °C
Boiling point: 688 °C

Heat of fusion: 2.2 kJ/mol
Heat of vaporization: 75.7 kJ/mol
Heat of atomization: 82.17 kJ/mol