So, which one it is?
For N2O4 N is 8
No, oxidation number of N is not 8. Are you sure you have not forgot oxidation number is a property of an atom, and there are two N atoms in the molecule?
Can't say the chemistry behind this reaction (nor behind the Te/NO3-
compound) makes sense to me.
I would try to treat TeNO3
(or whatever its expected formula is) as a salt - that is, separately Te (or Te+
) and separately NO3-
. After you have balanced half reactions just combine them, and then combine as many Te/NO3 pairs as possible.