It's Elemental: Lutetium
Basic physical and historical information.
Wikipedia: Lutetium
Properties of the element, including its history, applications, and characteristics.
EnvironmentalChemistry.com: Lutetium
Atomic structure, chemical and physical properties, and table of nuclides.
ChemGlobe: Lutetium
Electronic, thermal, and steric data along with an isotope table.
LANL: Lutetium
Basic information and history.
ChemicalElements.com: Lutetium
Basic information, atomic structure, and table of isotopes.
Visual Elements: Lutetium
Image, physical information, and key isotopes.
Lenntech: Lutetium
Physical data, chemical properties, health and environmental effects.
Lutetium
Data tables and historic information.
WebElements: Lutetium
Extensive information on history, uses, occurrence, compounds, and properties.
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