56
Ba
Barium
Alkaline earth metal period 6 group 2 s-block discovered: 1808
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 56
- Atomic mass
- 137.33 a.m.u.
- Electron configuration
- [Xe]6s2
- Electronegativity
- 0.89 on the Pauling scale
- Atomic radius
- 268 pm
- Ionization energy
- 5.212 eV
- Oxidation states
- +2
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 1000 K (726,85 °C)
- Boiling point
- 2170 K (1 896,85 °C)
- Density
- 3.62 g/cm³