General

Rubidium (Rb) properties


Atomic mass, symbol and atomic number

rubidium is a naturally occurring element with the element symbol Rb and atomic number 37. In the periodic table it stands with an atomic mass of 85.467 u in the 1st main group. The chemical element discovered by Wilhelm Bunsen in 1861 is not radioactive and is in a solid state of aggregation at room temperature.

Profile: Rubidium (Rubidium)

General
Chemical element:rubidium
Symbol:Rb
Atomic number:37
Group:Alkali metal group
Period:5
Block:s block
Series:alkali metals
Appearance:White
explorers:Robert Wilhelm Bunsen
Year of discovery:1861
Atomic properties
Atomic mass:85,467 and
Atomic radius:235 pm
Covalent radius:220 pm
Van der Waals radius:303 pm
Electron configuration:Kr 5s1
ionization:403.0 kJ / mol
Physical Properties
Physical state:firmly
Density:???
Crystal structure:cubic
Magnetism:paramagnetic
molar volume:55,76 · 10-6 m3/ mol
Mohs hardness:0,3
Melting point:39 ° C
Boiling point:688 ° C
Heat of fusion:2.19 kJ / mol
Heat of vaporization:69 kJ / mol
Thermal conductivity:58 W
Chemical properties
electronegativity:0,82

Did you know that ...

  • Rubidium after cesium is the second softest (Mohs hardness 0.3) element in the periodic table?
  • currently rubidium-based antidepressants are being tested?
  • Rubidium has a melting point of only 39 ° C?