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  1. Copper - Wikipedia

  2. Copper - Simple English Wikipedia, the free encyclopedia

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

  4. Copper - Wikiwand

  5. Copper conductor - Wikipedia

  6. Copper compounds - Wikipedia

  7. Copper Facts: Chemical and Physical Properties - ThoughtCo

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

  9. Copper: introduction to the chemical element - Explain that Stuff

  10. copper summary | Britannica