6 links
ChemicalElements.com: Barium
chemicalelements.com
Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Barium
environmentalchemistry.com
Atomic structure, chemical and physical properties, and table of nuclides.
WebElements: Barium
ebelements.com
Extensive information on history, uses, occurrence, compounds, and properties.
Wikipedia: Barium
en.wikipedia.org
Properties of the element, including its history, applications, and characteristics.
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