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56Ba137.327
Barium
Alkaline earth metalsBlock sPeriod 6Group 2solid at 20 °C
- Configuration :
- [Xe] 6s²
- Atomic mass :
- 137.327 u
- French :
- Baryum
3D Bohr-model representation of the Barium atom (symbol Ba, atomic number Z=56). Electron shell configuration: 2, 8, 18, 18, 8, 2 electrons.
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Bohr model · educational
Related lesson
Precipitation reactions
Solubility product Ksp, precipitation conditions, precipitation titrations.
10 minElectron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 6s²
Short[Xe] 6s²
Valence electrons2
KLMNOPQ shells
K2
L8
M18
N18
O8
P2
Electronegativity
Pauling0.89
Allen0.881
Mulliken (eV)—
Atomic radii
Empirical215 pm
Calculated253 pm
Covalent215 pm
Van der Waals268 pm
Ionic radii (Shannon-Prewitt)
+2135 pm
Successive ionisation energies
I₁502.9 kJ/mol
I₂965.2 kJ/mol
I₃3600 kJ/mol
Electron affinity13.95 kJ/mol
Oxidation states
+1+2
Bold states = most common.