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