ChemGlobe: Tantalum
- Electronic, thermal, and steric data along with an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/73.html

LANL: Tantalum
- History, production, properties, and uses.
- http://periodic.lanl.gov/elements/73.html

Wikipedia: Tantalum
- Properties of the element, including its history, applications, and characteristics.
- http://en.wikipedia.org/wiki/Tantalum

Lenntech: Tantalum
- Physical data, chemical properties, health and environmental effects.
- http://www.lenntech.com/Periodic-chart-elements/Ta-en.htm

EnvironmentalChemistry.com: Tantalum
- Atomic structure, chemical and physical properties, and table of nuclides.
- http://environmentalchemistry.com/yogi/periodic/Ta.html

ChemicalElements.com: Tantalum
- Basic information, atomic structure, and isotopes.
- http://www.chemicalelements.com/elements/ta.html

It's Elemental: Tantalum
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele073.html

Visual Elements: Tantalum
- Discovery, uses, physical information, and key isotopes.
- http://www.chemsoc.org/viselements/pages/tantalum.html