Barium (Ba) — Element 56: Properties & Data | Aladdin Scientific
Barium(Ba) — Element 56
Barium (Ba) is a alkaline earth metal with atomic number 56 and atomic mass 137.33. It has melting point 1000 K (727 °C), boiling point 2170 K (1897 °C), density 3.62 g/cm³. It sits in group 2 and period 6 of the periodic table and was discovered in 1808.
Key facts
| Atomic mass | 137.3300 u |
|---|---|
| Electron configuration | [Xe]6s2 |
| Oxidation states | +2 |
| Electronegativity (Pauling) | 0.89 |
| Atomic radius (van der Waals) | 268 pm |
| Ionization energy | 5.212 eV |
| Melting point | 1000 K |
| Boiling point | 2170 K |
| Density | 3.62 g/cm³ |
| Standard state | Solid |
| Year discovered | 1808 |
Frequently asked questions
What is the electron configuration of barium?
The ground-state electron configuration of barium is [Xe]6s2.
What group and period is barium in?
Barium (Ba) is in group 2 and period 6 of the periodic table, classified as a alkaline earth metal.
What is the melting point of barium?
Barium melts at 1000 K (727 °C).
What is the standard state of barium?
Barium is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .