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under one method - P has oxidation number of -3, this is where H is assigned +1 except in metal hydrides. Using the electronegativity method and using Pauling EN H is slightly more electronegative than P so on that method P would be +3. It all depends where you are taught.

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What is the oxidation number of PH3?

The oxidation number of phosphorus in PH3 is -3.


What is the oxidation number of ph3(p)?

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What is the oxidation number of P in PH3?

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How do you prove the oxidation number of P is -3?

I don't know if this is what you mean but, you know phosphorus will have an oxidation number of -3 because it has 5 valance electrons. For phosphorus to become stable it needs to gain 3 electrons. This adds 3 negative charges to it and gives it the -3 charge.


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