56 Ba 137.328
Barium
alkaline earth metal
Properties
- Atomic number
- 56
- Atomic mass
- 137.328 u
- Category
- alkaline earth metal
- Group
- 2
- Period
- 6
- Block
- s-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- 0.89 (Pauling)
- Density
- 3.51 g/cm³
- Melting point
- 726.85 °C
- Boiling point
- 1844.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s²
Noble-gas shorthand: [Xe] 6s²
Electrons per shell: 2, 8, 18, 18, 8, 2 — that's 2 in the outermost shell.
About 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.
- Discovered by Carl Wilhelm Scheele
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.