56 Ba
Alkaline earth metal
Barium
Used in medical imaging.
Properties of Barium
- Atomic number (Z)
- 56
- Symbol
- Ba
- Atomic mass
- 137.33 g/mol
- Category
- Alkaline earth metal
- Group
- 2
- Period
- 6
- Electron configuration
- [Xe] 6s²
- Electronegativity (Pauling)
- 0.89
- Atomic radius
- 253 pm
- First ionization energy
- 503 kJ/mol
- Melting point
- 1000 K (726.9 °C)
- Boiling point
- 2170 K (1896.8 °C)
- Density
- 3.62 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1808