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OpenStudy (anonymous):

What is the oxidation number of NaMnO4? please help.

OpenStudy (anonymous):

Na has +1 and O has 2- charge. Since there are 4 atoms it has a 8- charge. (+1) + (8-) = 7- Because you didn't say that there was an overall charge on the molecule the Mn has a +7 charge for an overall 0 on the molecule

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