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, which is 2 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
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
Barium: frequently asked questions
- What is Barium?
- Barium (Ba) is the chemical element with atomic number 56. It is a metal: specifically an alkaline earth metal.
- What is the atomic number of Barium?
- Barium's atomic number is 56, which means every Barium atom has 56 protons in its nucleus.
- What is the electron configuration of Barium?
- The electron configuration of Barium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 (noble-gas shorthand: [Xe] 6s2). Its electrons are arranged in shells of 2, 8, 18, 18, 8, 2, with 2 in the outermost shell.
- Is Barium a metal or a nonmetal?
- Barium is a metal: specifically an alkaline earth metal.
- What group and period is Barium in?
- Barium is in group 2 and period 6 of the periodic table.
- Is Barium a solid, liquid, or gas?
- At room temperature, Barium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.