- Visual Elements: Lutetium - http://www.chemsoc.org/viselements/pages/lutetium.html
- Image, physical information, and key isotopes.
- ChemicalElements.com: Lutetium - http://www.chemicalelements.com/elements/lu.html
- Basic information, atomic structure, and table of isotopes.
- It's Elemental: Lutetium - http://education.jlab.org/itselemental/ele071.html
- Basic physical and historical information.
- EnvironmentalChemistry.com: Lutetium - http://environmentalchemistry.com/yogi/periodic/lu.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Lutetium - http://www.lenntech.com/periodic-chart-elements/lu-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Lutetium - http://en.wikipedia.org/wiki/lutetium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Lutetium - http://periodic.lanl.gov/elements/71.html
- Basic information and history.
- ChemGlobe: Lutetium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/71.html
- Electronic, thermal, and steric data along with an isotope table.
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