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WebElements: Tantalum WebElements: Tantalum- Extensive information on history, uses, occurrence, compounds, and properties. Wikipedia: Tantalum Wikipedia: Tantalum- Properties of the element, including its history, applications, and characteristics. EnvironmentalChemistry.com: Tantalum EnvironmentalChemistry.com: Tantalum- Atomic structure, chemical and physical properties, and table of nuclides. ChemicalElements.com: Tantalum ChemicalElements.com: Tantalum- Basic information, atomic structure, and isotopes. It's Elemental: Tantalum It's Elemental: Tantalum- Basic physical and historical information.