Oxidation states are assigned to atoms in a molecule or compound using a general set of rules.
Take a look at this tutorial to see the rules and test yourself.
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Oxidation-reduction reaction, also called redox reaction, any chemical reaction in which the oxidation number of a participating chemical species changes.
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Many oxidation- Most oxidation-reduction (redox) processes involve the transfer of oxygen atoms, hydrogen atoms, or electrons, with all three processes sharing two important characteristics: (1) they are coupled—i.e., in any oxidation reaction a reciprocal reduction occurs, and (2) they involve a characteristic net chemical change—i.e., an atom or electron goes from one unit of matter to another.An element that accepts electrons is an oxidizing agent.Chlorine is the strongest oxidizing agent compared to bromine and iodine.Whenever something is oxidized, something else must undergo the opposite (loss of electrons), reduction.A species that causes oxidation is called an oxidant, oxidizer, or oxidizing agent.