It's Elemental: Copper
Basic physical and historical information.
Wikipedia: Copper
Properties of the element, including its history, applications, and characteristics.
EnvironmentalChemistry.com: Copper
Atomic structure, chemical and physical properties, and table of nuclides.
Radiochemistry of Copper
Full text of the monograph by F. F. Dyer (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF]
USGS Minerals Information: Copper
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
Copper
Properties and applications along with photographs and chemical formulas of occurrences.
ChemGlobe: Copper
Electronic, thermal, and steric data along with an isotope table.
LANL: Copper
History, properties, sources, and uses.
ChemicalElements.com: Copper
Basic information, atomic structure, and table of isotopes.
Visual Elements: Copper
Image, general and physical information, source, uses, key isotopes, and ionisation energies.
Lenntech: Copper
Physical data, chemical properties, health and environmental effects.
Copper
Data tables and historic information.
WebElements: Copper
Extensive information on history, uses, occurrence, compounds, and properties of the element.
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