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When an atom forms an ion.When gaining or giving eletrons.

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The oxidation number of an atom is determined by the number of electrons it gains, loses, or shares when forming a chemical bond. The rules for assigning oxidation numbers are based on the electronegativity of the elements and the structure of the compound. Generally, less electronegative elements have more positive oxidation numbers, while more electronegative elements have more negative oxidation numbers.

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10mo ago
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Q: How do atom get an oxidation number?
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