56Solid
Ba 137.327 Atomic mass · uAlkaline earth metals
Barium
Barium is a chemical element with symbol Ba and atomic number 56. It is the fifth element in Group 2, a soft silvery metallic alkaline earth metal. Because of its high chemical reactivity barium is never found in nature as a free element.
Discovery 1808 (Carl Wilhelm Scheele)
K2L8M18N18O8P2
Physical properties
Values for the element in its standard state.
- Density
- 3.51g/cm³
- Melting point
- 1,000K
- Boiling point
- 2,143K
- Atomic radius
- 198pm
- Bonding type
- Metallic
- Molar heat
- 28.07J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 6s, 2 electrons;
[Xe] represents 54 core electrons. The full view shows them explicitly.
56 electrons Orbital order preserved from source
- Electronegativity
- 0.89Pauling scale
- First ionization energy
- 503kJ/mol
- Electron affinity
- 14kJ/mol
- Van der Waals radius
- Not available
Ba BariumAtomic number 56
503kJ/mol
Atomic numberGaps indicate unavailable data
About barium
- Appearance
- Not recorded
- Discovery
- 1808 (Carl Wilhelm Scheele)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.