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Copper - Wikipedia
Copper - Element information, properties and uses | Periodic Table
Copper Facts – Cu or Atomic Number 29 - Science Notes and …
Copper Facts: Chemical and Physical Properties - ThoughtCo
Copper (Cu) - Periodic Table
Periodic Table of Elements: Los Alamos National Laboratory
Copper - The Chemical Elements
WebElements Periodic Table » Copper » the essentials
Copper (Cu) - Chemical Elements.com
Copper - Periodic Table