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Group one would be +1, group two would be +2, group seventeen would be -1. Neutral compounds would have a total oxidation number of 0, so you can usually figure out individual oxidation numbers of atoms from knowing one atom out of the compound (E.g. CrCl3, Cl has a -1 oxidation state, so Cr would be +3).Maya Pakulski 1D wrote:How do you find oxidation numbers?
Oxidation numbers of many elements are not fixed. Here is a site with more information about some rules that one must follow when assigning oxidation numbers: https://www.thoughtco.com/rules-for-assigning-oxidation-numbers-607567.
If you look at the lewis structure of ozone, it does have individual oxygen formal charges but the overall formal charge is 0 and there is resonance; the oxidation number of the whole molecule of ozone (not of the individual oxygen atoms that compose it) is thus 0.
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