- A series of metals, listed in order of their relative ease of oxidation. The greater the tendency to oxidize, the higher on the list. Less noble metals, such as magnesium and sodium, are at the top of such a list, while noble metals, such as platinum and gold, are at the bottom of it. Alternatively, the more noble metals may appear higher on the list, with the less noble metals lower, when the list is in order of their relative resistance to oxidation.
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