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  1. Copper - Wikipedia

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

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

  4. Copper Facts - Science Notes and Projects

  5. Facts About Copper - Live Science

  6. Copper Facts: Chemical and Physical Properties - ThoughtCo

  7. Copper - Wikiwand

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

  9. Copper - Compounds, Properties, Uses | Britannica

  10. Properties & Uses - Copper