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To compare this between different elements, do we need to compare the same increase in oxidation number? For example, if we were comparing Cu and Cr, do we have to use Cu2+ ---> Cu in comparison with Cr2+ ---> Cr, or can we compare between different oxidation state changes?
So is there any importance in comparing equal oxidation states going to a neutral atom? For example, would Cu2+ ---> Cu and Cr3+ ---> Cr be just as valid a comparison as Cu2+ ---> Cu and Cr2+ ---> Cr?
The more negative the E standard for a given half reaction is, the less likely that reaction is to take place in the given reduction state. If you think about it, a more negative E standard yields a more positive delta G with a lowered likelihood of spontaneity. So the higher value will be reduced and the lower value will be oxidized.
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