- Britannica Nobel Prize: Radium
- Detailed overview and data.
- ChemGlobe: Radium
- Electronic, thermal, and steric data along with an isotope table.
- ChemicalElements.com: Radium
- Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Radium
- Atomic structure, chemical and physical properties, and table of nuclides.
- It's Elemental: Radium
- Basic physical and historical information.
- LANL: Radium
- History, sources, properties, and uses.
- Lenntech: Radium
- Physical data, chemical properties, health and environmental effects.
- Visual Elements: Radium
- Image, general and physical information, source, uses, key isotopes, and ionisation energies.
- WebElements: Radium
- Extensive information on history, uses, occurrence, compounds, and properties.
- Wikipedia: Radium
- Properties of the element, including its history, applications, and characteristics.
- Radiochemistry of Radium
- Full text of the monograph by Murrell L. Salutsky (W.R. Grace and Co., Research Division, Washington Research Center, Clarksville, Maryland) and H. W. Kirby (Mound Laboratory, Miamisburg, Ohio). [PDF]
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