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