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The oxidation numbers of every atom in a neutral molecule must add up to:

ANine
BZero
CTwo
DFour
Answer & Solution
Correct answer: B. Zero
1. The rule is that the total equals the overall charge. 2. A neutral molecule carries no charge at all. 3. So the oxidation numbers sum to zero. _Source: OpenStax Chemistry 2e, Chapter 4, Stoichiometry of Chemical Reactions._
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