Tantalum

See also:

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

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