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Copper - Wikipedia
Copper | Uses, Properties, & Facts | Britannica
Copper - Element information, properties and uses | Periodic Table
Copper | Cu (Element) - PubChem
Copper Facts – Cu or Atomic Number 29 - Science Notes and …
Copper (Cu) - Periodic Table
Copper Facts: Chemical and Physical Properties - ThoughtCo
Copper Element | History, Uses, Facts, Physical Chemical …
Copper (Cu) Element: Important Physical-Chemical Properties,
Copper (Cu) - Periodic Table