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Oxidation Number of Periodic Table Elements Oxidation number or state of periodic table elements in a chemical compound or molecule is the formal charge (positive or negative) which assigned to the element if all the bonds in the compounds are ionic. In chemistry, the oxidation number or state is defined as the total number of electrons lost or gained by atoms or ions to form a chemical bond. Some general rules used in learning chemistry to find out or calculate the oxidation number or state ... Oxidation State Definition Oxidation number of an atom is the charge that atom would have if the compound is composed of ions. It represents the number of electrons an atom gains or losses when bonded with other atom in a molecule. How to find oxidation number & oxidation state - important concepts in chemistry. We go over the rules and make them very easy to understand. This page explains what oxidation states (oxidation numbers) are and how to calculate and use them.