Entering the Oxidation-Reduction Zone

Oxidation and reduction are processes that describe when an atom transfers an electron. If the atom gains an electron, it s reduced if the atom donates an electron, it s oxidized. 

There are two primary mnemonics (memory aides) to help remember which is which  

Redox reactions are the principle way that nearly all the elements are purified after they have been extracted as minerals. 

Oxidation refers to gaining oxygen, losing hydrogen, or losing electrons. It s an increase in the oxidation number. It s also an increase in the valence number of the atom. 

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