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For a single atom ion, the oxidation number equals the:

ACharge on it
BChange in it
CChain of it
DChoice of it
Answer & Solution
Correct answer: A. Charge on it
1. A sodium ion carries plus one. 2. A chloride ion carries minus one. 3. It equals the charge on the ion. _Source: syllabus Chemistry, Unit 7 'Redox Reactions'_
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