—> a potential difference exists between the metal and the solution it is around
—> standard electrode potentials are a measure of the potential difference that can exist between metals and their solutions
—> the more negative the value, the more likely it oxidises - loses electrons, become a positive ion
—> the less negative the value, the less likely it oxidises - gains electrons, become a negative ion
—> the more positive cation, is more likely to get discharged at the cathode
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