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copper, a transition metal with chemical symbol Cu and atomic number 29. Copper participates in chemical reactions via a wide range of oxidation numbers from -2 to +4 but most commonly is found in organic cuprous and cupric complexes with oxidation states of +1 and +2, respectively.

Atomic mass: 63.546 u

Symbol: Cu

Electron configuration: [Ar] 3d¹4s¹

Number of Protons: 29

Number of Neutrons: 35

Number of Electrons: 29

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