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  1. Copper - Wikipedia

  2. Copper | Uses, Properties, & Facts | Britannica

  3. Copper - Element information, properties and uses | Periodic Table

  4. Copper | Cu (Element) - PubChem

  5. Copper Facts: Chemical and Physical Properties - ThoughtCo

  6. Copper (Cu) - Periodic Table

  7. Copper Element | History, Uses, Facts, Physical Chemical

  8. Copper | Cu | CID 23978 - PubChem

  9. Comprehensive Guide to Copper: Uses, Properties, and History

  10. Copper (Cu) Element: Important Physical-Chemical Properties,