ChemGlobe: Yttrium - Electronic, thermal, and steric data along with an isotope table.
ChemicalElements.com: Yttrium - Basic information, atomic structure, and isotopes.
The Columbia Encyclopedia: Yttrium - Overview for the general reader.
EnvironmentalChemistry.com: Yttrium - Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Yttrium - Basic physical and historical information.
LANL: Yttrium - History, sources, properties, uses, and isotopes.
Lenntech: Yttrium - Physical data, chemical properties, health and environmental effects.
Visual Elements: Yttrium - Image, animation, uses, physical information, and ionisation energies.
WebElements: Yttrium - Extensive information on history, uses, occurrence, compounds, and properties of the element.
Wikipedia: Yttrium - Properties of the element, including its history, applications, and characteristics.
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