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WebElements: Niobium - http://www.webelements.com/webelements/elements/text/Nb/key.html
Extensive information on history, uses, occurrence, compounds, and properties of the element. |
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LANL: Niobium - http://periodic.lanl.gov/elements/41.html
History, sources, properties, and uses. |
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Wikipedia: Niobium - http://en.wikipedia.org/wiki/Niobium
Properties of the element, including its history, applications, and characteristics. |
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ChemicalElements.com: Niobium - http://www.chemicalelements.com/elements/nb.html
Basic information, atomic structure, and isotopes. |
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USGS Minerals Information: Niobium - http://minerals.usgs.gov/minerals/pubs/commodity/niobium/
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format). |
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It's Elemental: Niobium - http://education.jlab.org/itselemental/ele041.html
Basic physical and historical information. |
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EnvironmentalChemistry.com: Niobium - http://environmentalchemistry.com/yogi/periodic/Nb.html
Atomic structure, chemical and physical properties, and table of nuclides. |
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Visual Elements: Niobium - http://www.chemsoc.org/viselements/pages/niobium.html
Image, uses, general information, and ionisation energies. |
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ChemGlobe: Niobium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/41.html
Electronic, thermal, and steric data along with a table of isotopes. |
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Lenntech: Niobium - http://www.lenntech.com/Periodic-chart-elements/Nb-en.htm
Physical data, chemical properties, and health effects. |