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Top 20 Directory:
Top : Science : Chemistry : Elements : Barium
Sites:
  		• Barium: Data tables and historic information.
  		• 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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