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The oxidation number of an atom is the charge that the atom would have if a compound has its ions
For neutral substances such as oxygen gas(with two oxygen atoms) and ozone(with three oxygen atoms), the oxidation number is zero.
Oxidation numbers is the number of electron(s) an atom requires to form an ion of itself
Atoms that lose electrons to form atoms(such as metals have positive oxidation numbers. For instance, a sodium atom loses one electron to form a sodium ion,hence its oxidation number is +1
However, a chlorine atom acquires one electron to form a chloride ion, hence its oxidation number is -1
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