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Directory Sites
Image, appearance, source, uses, key isotopes, and ionisation energies.
www.chemsoc.org
Basic physical and historical information.
education.jlab.org
Basic information, atomic structure, and isotopes.
www.chemicalelements.com
Data tables and historic information.
www.scescape.net
EnvironmentalChemistry.com: Barium
Atomic structure, chemical and physical properties, and table of nuclides.
environmentalchemistry.com
Extensive information on history, uses, occurrence, compounds, and properties.
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
History, sources, properties, and uses.
periodic.lanl.gov
Electronic, thermal, and steric data, along with an isotope table.
partisans.spurious.biz