Barium (Ba) properties

Atomic mass, symbol and atomic number

barium is a naturally occurring element with the elemental symbol Ba and atomic number 56. In the periodic table it stands with an atomic mass of 137.327 u in the 7th main group. The chemical element discovered by Wilhelm Scheele in 1774 is not radioactive and is in a solid state of aggregation at room temperature.

Profile: Barium (English Barium)

Chemical element:barium
Atomic number:56
Group:alkaline earth metal
Block:s block
Series:alkaline earth metals
explorers:Carl Wilhelm Scheele
Year of discovery:1774
Atomic properties
Atomic mass:137,327 u
Atomic radius:215 pm
Covalent radius:215 pm
Van der Waals radius:268 pm
Electron configuration:Xe 6s2
ionization:502.9 kJ / mol
Physical Properties
Physical state:firmly
Crystal structure:cubic
molar volume:38,16 · 10-6 m3/ mol
Mohs hardness:1,25
Melting point:727 ° C
Boiling point:1637 ° C
Heat of fusion:8.0 kJ / mol
Heat of vaporization:149 kJ / mol
Thermal conductivity:18 W
Chemical properties

Did you know that ...

  • China is responsible for half of the world's barium production?
  • Barium compounds in the explosion of fireworks rockets provide for the green color?
  • Barium almost only in the form of minerals, e.g. Barite (BaSO4) occurs?
  • Barium was known in the Middle Ages under the name "Bologna stone"?