Respuesta :

Answer:

Here every atom of oxygen takes in 2 electrons, which means that a molecule of oxygen will take in 4 electrons. On the other hand, the oxidation state of magnesium is going from 0 on the reactants' side to +2 on the products' side, which means that magnesium is being oxidize

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answer : c.  O2+ 4e- ->20^2-