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The oxidation number of K is +1. The oxidation number of Cl is -1. You assign oxidation numbers to the elements in a compound by using the Rules for Oxidation Numbers. The oxidation number of a monatomic ion equals the charge of the ion. The oxidation number of a Group 1 element in a compound is +1.
Rule 5: The oxidation number of oxygen in a compound is usually â2. If, however, the oxygen is in a class of compounds called peroxides (for example, hydrogen peroxide), then the oxygen has an oxidation number of â1. If the oxygen is bonded to fluorine, the number is +1. Rule 6: The oxidation state of hydrogen in a compound is usually +1. If the hydrogen is part of a binary metal hydride (compound of hydrogen and some metal), then the oxidation state of hydrogen is â1. Rule 7: The oxidation number of fluorine is always â1.