ChemGlobe: Radium
Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/88.html
ChemicalElements.com: Radium
Basic information, atomic structure, and isotopes.
http://www.chemicalelements.com/elements/ra.html
EnvironmentalChemistry.com: Radium
Atomic structure, chemical and physical properties, and table of nuclides.
http://environmentalchemistry.com/yogi/periodic/Ra.html
It's Elemental: Radium
Basic physical and historical information.
http://education.jlab.org/itselemental/ele088.html
LANL: Radium
History, sources, properties, and uses.
http://periodic.lanl.gov/elements/88.html
Lenntech: Radium
Physical data, chemical properties, health and environmental effects.
http://www.lenntech.com/Periodic-chart-elements/Ra-en.htm
Visual Elements: Radium
Image, general and physical information, source, uses, key isotopes, and ionisation energies.
http://www.chemsoc.org/viselements/pages/radium.html
WebElements: Radium
Extensive information on history, uses, occurrence, compounds, and properties.
http://www.webelements.com/webelements/elements/text/Ra/key.html
Wikipedia: Radium
Properties of the element, including its history, applications, and charateristics.
http://en.wikipedia.org/wiki/Radium
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] <small>(December, 1964)</small>
http://library.lanl.gov/cgi-bin/getfile?rc000041.pdf
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