- ChemGlobe: Barium
- Electronic, thermal, and steric data, along with an isotope table.
- ChemicalElements.com: Barium
- Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Barium
- Atomic structure, chemical and physical properties, and table of nuclides.
- It's Elemental: Barium
- Basic physical and historical information.
- LANL: Barium
- History, sources, properties, and uses.
- Lenntech: Barium
- Physical data, chemical properties, health and environmental effects.
- Visual Elements: Barium
- Image, appearance, source, uses, key isotopes, and ionisation energies.
- WebElements: Barium
- Extensive information on history, uses, occurrence, compounds, and properties.
- Wikipedia: Barium
- Properties of the element, including its history, applications, and characteristics.
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