See also:

• Science: Chemistry: Elements: Transition Metals  (3)

	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.

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