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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.
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).
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 charateristics.