It's Elemental: Lead - Basic physical and historical information. ChemicalElements.com: Lead - Basic information, atomic structure, and isotopes table. USGS Minerals Information: Lead - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format). EnvironmentalChemistry.com: Lead - Atomic structure, chemical and physical properties, and table of nuclides. Lenntech: Lead - Physical data, chemical properties, health and environmental effects. Wikipedia: Lead - Properties of the element, including its history, applications, and characteristics.