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Image, animation, source, uses, key isotopes, and ionisation energies.
www.chemsoc.org
Full text of the monograph by W. T. Mullins and G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF]
lib-www.lanl.gov
Basic physical and historical information.
education.jlab.org
Basic information, atomic structure, and table of isotopes.
www.chemicalelements.com
Data tables and historic information.
www.scescape.net
EnvironmentalChemistry.com: Sodium
Atomic structure, chemical and physical properties, and table of nuclides.
environmentalchemistry.com
Extensive information on history, uses, occurrence, compounds, and properties of the element.
www.webelements.com
Physical data, chemical properties, health and environmental effects.
www.lenntech.com
Properties of the element, including its history, applications, and characteristics.
en.wikipedia.org
Sources, properties, uses, and compounds.
periodic.lanl.gov
Electronic, thermal, and steric data along with basic information.
partisans.spurious.biz