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Question

What is the oxidation number of Na?

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Solution

Oxidation number is conceived to be the charge associated with a given atom, when it donates or accepts electrons according to predetermined rules...given here for your chemical pleasure....

1. The oxidation number of a free element is always 0.

2. The oxidation number of a mono-atomic ion is equal to the charge of the ion.

3. For a given bond, X-Y, the bond is split to give X+ and Y where Y is more electronegative than X.

4. The oxidation number of H is +1, but it is -1 in when combined with less electronegative elements.

5. The oxidation number of O in its compounds is usually -2, but it is -1 in peroxides.

6. The oxidation number of a Group 1 element in a compound is +1.

7. The oxidation number of a Group 2 element in a compound is +2.

8. The oxidation number of a Group 17 element in a binary compound is -1.

9. The sum of the oxidation numbers of all of the atoms in a neutral compound is 0.

10. The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.

And thus for elemental sodium we gots Na(0).. Sodium is a good reductant, and for most of its reaction chemistry we get Na+=Na(I+)... In the given scenario, the metal has NEITHER accepted nor donated its single valence electron...


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