- It's Elemental: Radium - http://education.jlab.org/itselemental/ele088.html
- Basic physical and historical information.
- ChemicalElements.com: Radium - http://www.chemicalelements.com/elements/ra.html
- Basic information, atomic structure, and isotopes.
- Visual Elements: Radium - http://www.chemsoc.org/viselements/pages/radium.html
- Image, general and physical information, source, uses, key isotopes, and ionisation energies.
- EnvironmentalChemistry.com: Radium - http://environmentalchemistry.com/yogi/periodic/ra.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Radium - http://www.lenntech.com/periodic-chart-elements/ra-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Radium - http://en.wikipedia.org/wiki/radium
- Properties of the element, including its history, applications, and charateristics.
- LANL: Radium - http://periodic.lanl.gov/elements/88.html
- History, sources, properties, and uses.
- ChemGlobe: Radium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/88.html
- Electronic, thermal, and steric data along with an isotope table.
- WebElements: Radium - http://www.webelements.com/webelements/elements/text/ra/key.html
- Extensive information on history, uses, occurrence, compounds, and properties.
- Radiochemistry of Radium - http://library.lanl.gov/cgi-bin/getfile?rc000041.pdf
- 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).
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