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Both copper and zinc has an electronegativity that is smaller than hydrogen, but why does copper have a positive electrode potential while zinc has a negative one? And lead (which has a greater electronegativity than hydrogen) does also have a negative electrode potential.

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    $\begingroup$ In short, because electrode potentials have (almost) nothing to do with electronegativity. $\endgroup$ – Ivan Neretin Sep 15 '15 at 18:50

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