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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.
To find the oxidation number of sulfur, it is simply a matter of using the formula SO2 and writing the oxidation numbers as S = (x) and O2 = 2(-2) = -4. Using the rule and adding the oxidation numbers in the compound, the equation becomes x +(-4 ) = 0. Solving for x, it is evident that the oxidation number for sulfur is +4. In chemical compounds, an atom's oxidation number refers to the charge that atoms have if the compound consists of only ions. When writing compound formulas or reactions, there are rules used to assign oxidation numbers.