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