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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 – Cu or Atomic Number 29 - Science Notes and …

  6. Copper (Cu) - Periodic Table

  7. Copper Facts: Chemical and Physical Properties - ThoughtCo

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

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

  10. Copper (Cu) - Periodic Table