Скачать или смотреть How to find the Oxidation Number for P in the NaPF6 ion. (Sodium hexafluorophosphate ion)

To find the correct oxidation state of P in NaPF6 (the Sodium hexafluorophosphate ion), and each element in the ion, we use a few rules and some simple math.

First, since the Sodium hexafluorophosphate ion has an overall charge of we could say that the oxidation numbers in NaPF6 need to add up to charge on the ion.

We write the oxidation number (O.N.) for elements that we know and use these to figure out oxidation number for P.


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RESOURCES
How to Find Oxidation Numbers (rules and examples):    • How to Find Oxidation Numbers  (Rules and ...  
Oxidation Numbers Practice:    • Finding Oxidation Numbers Practice Problem...  

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GENERAL RULES
Free elements have an oxidation state of zero (e.g. Na, Fe, H2, O2, S8).
In an ion the all Oxidation numbers must add up to the charge on the ion.
In a neutral compound all Oxidation Numbers must add up to zero.
Group 1 = +1
Group 2 = +2
Hydrogen with Non-Metals = +1
Hydrogen with Metals (or Boron) = -1
Fluorine = -1
Oxygen = -2 (except in H2O2 or with Fluorine)
Group 17(7A) = -1 except with Oxygen and other halogens lower in the group
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