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ChemGlobe: Zirconium - Electronic, thermal, and steric data along with an isotope table.
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.