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14-01-2021
Chemistry

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How do you determine if a polyatomic ion needs to be counted together?

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GMigo0214 GMigo0214

14-01-2021

Answer:

Calculate from Oxidation Number

The oxidation number of oxygen is -2, and the oxidation number of hydrogen is +1. Add together the oxidation numbers of all the atoms in the polyatomic ion. In the example, -2 +1 = -1. This is the charge on the polyatomic ion.

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