Copper can form both cu+ and cu2+ ions, but zinc can form only Zn2+ ions. Why?

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C u^{2 +}

Z n^{2 +}

F e^{2 +}, N i^{2 +}, C a^{2 +}, K^{+}, M g^{2 +}, N a^{+}, C u^{2 +}, Z n^{2 +}

E_{C u^{2 +} | C u}^{⊖} = 0.34 V, E_{Z n^{2 +} | Z n}^{⊖} = - 0.76 V

E_{A g^{\oplus} | A g}^{⊖} = 0.80 V

K_{4} [{F e (C N)}_{6}]

{C d}^{2 +}, {C u}^{2 +}, {Z n}^{2 +}, {F e}^{3 +}, {P b}^{2 +}

{B i}^{3 +}

M g

F e

C u^{2 +}

M g_{(s)} + C u^{2 +} ⇋ M g^{2 +} + C u_{(s)}; K_{1} = 6 \times 10^{90}

F e_{(s)} + C u^{2 +} ⇋ F e^{2 +} + C u_{(s)}; K_{2} = 3 \times 10^{26}

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