See also:

• Science: Chemistry: Elements: Transition Metals  (3)
• Science: Technology: Metallurgy  (51)

• ChemGlobe: Niobium - Electronic, thermal, and steric data along with a table of isotopes.
• ChemicalElements.com: Niobium - Basic information, atomic structure, and isotopes.
• EnvironmentalChemistry.com: Niobium - Atomic structure, chemical and physical properties, and table of nuclides.
• It's Elemental: Niobium - Basic physical and historical information.
• LANL: Niobium - History, sources, properties, and uses.
• Lenntech: Niobium - Physical data, chemical properties, and health effects.
• USGS Minerals Information: Niobium - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
• Visual Elements: Niobium - Image, uses, general information, and ionisation energies.
• WebElements: Niobium - Extensive information on history, uses, occurrence, compounds, and properties of the element.
• Wikipedia: Niobium - Properties of the element, including its history, applications, and characteristics.

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