See also:

• Science: Chemistry: Elements: Alkali Earth Metals  (1)

• 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 charateristics.

• 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] (December, 1964)