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ChemGlobe: Lead
Electronic, thermal, and steric data along with an isotope table.
WebElements: Lead
Extensive information on history, uses, occurrence, compounds, and properties.
EnvironmentalChemistry.com: Lead
Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Lead
Basic physical and historical information.
Wikipedia: Lead
Properties of the element, including its history, applications, and charateristics.
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