Posted by Jasmine on Sunday, May 13, 2012 at 6:30pm.
Its the one that loses electrons; i.e., the one that is oxidized. To help out a little I can tell you that O2 goes from zero on the left to -2 on the right for each atom. Mg goes from zero on the left to +2 on the right for each atom.
2Mg + O2 ==> 2MgO
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