Barium is a chemical element in the periodic table that has the symbol Ba and atomic number 56. A soft silvery metallic element, barium is an alkaline earth metal and melts at a very high temperature. It is never found in nature in its pure form due to its reactivity with air. Its oxide is historically known as baryta but it reacts with water and carbon dioxide and is not found as a mineral. The most common naturally occurring minerals are the very insoluble barium sulfate, BaSO4 (barite), and carbonate, BaCO3 (witherite).

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