- ChemGlobe: Gadolinium
- Electronic, thermal, and steric data along with an isotope table.
- ChemicalElements.com: Gadolinium
- Basic information, atomic structure, and isotopes.
- Corrosionsource.com: Gadolinium
- History, occurrence, properties, isotopes, and uses.
- EnvironmentalChemistry.com: Gadolinium
- Atomic structure, chemical and physical properties, and table of nuclides.
- It's Elemental: Gadolinium
- Basic physical and historical information.
- LANL: Gadolinium
- History, sources, properties, and uses.
- Lenntech: Gadolinium
- Physical data, chemical properties, health and environmental effects.
- Visual Elements: Gadolinium
- Image, source, uses, physical information, and key isotopes.
- Wikipedia: Gadolinium
- Properties of the element, including its history, applications, and characteristics.
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