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