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Science: Chemistry: Elements: Niobium

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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.

Niobium
Data tables and historic information.

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 charateristics.

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