Periodic table

 

 

Atomic number:37

Group numbers:1

Period:5

Electronic configuration:[Kr] 5s¹

Formal oxidation number:+1

Electronegativities:0.82

Atomic radius / pm:247.5

Relative atomic mass:85.4678 ± 0.0003

 

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.

PHYSICAL PROPERTIES

Density / g dm^-3:1532 (293 K)

 1475 (m.p.)

Molar volume / cm³mol^-1:55.79 (293 K)

 57.94 (m.p.)

Electrical resistivity / μΩcm:12.5 (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m^-1K^-1:52.8

Melting point / °C:39.31

Boiling point / °C:688

Heat of fusion / kJ mol^-1:2.2

Heat of vaporization / kJ mol^-1:75.7

Heat of atomization / kJ mol^-1:82.17

IONIZATION ENERGIES

First ionization energy / kJ mol^-1:403.03

Second ionization energy / kJ mol^-1:2632.62

Third ionization energy / kJ mol^-1:3859.44

ABUNDANCE OF ELEMENTS

in the atmosphere / ppm:-

in the Earth's crust / ppm:32

in the oceans / ppm:0.12

CRYSTALLOGRAPHIC DATA

ISOTOPES

REDUCTION POTENTIALS

 

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Citing this page:

Generalic, Eni. "Rubidium." EniG. Periodic Table of the Elements. 16 May 2013. KTF-Split. {Date of access}. <http://www.periodni.com/rb.html>.