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Yes, since it has a charge of -1 that is the total charge you want to get at the end. Since oxygen has a -2 charge and there are 4 that makes it minus 8 so in order to get a net of -1 the remaining element would have a charge of +7.
Yes, oxidation rules follow a hierarchy when determining oxidation numbers. For example, the oxidation number of oxygen in compounds is usually -2, which pertains to this question about permanganate. I believe a list of the rules is in our textbook, or online.
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