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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.
It is understood that Na has a 1+ oxidation number and O has a 2- oxidation number. Because the total oxidation number of this compound will equal 0, we can set up an equation. We have 2 Na molecules so the total oxidation number is 2+ and we have 3 O molecules so the total oxidation number is 6-. Because we dont know carbon, we set up an equation: 2+x-6=0. x-4=0.