Question

what are the oxidation number rules

Answer 1

1.oxidaton number for an elemnt or compound in its free state is zero
2.elemnt or compound with ion whether monoatomic or diatomic has same oxidation number as the ion.
3.the sum of all oxidation numbers in a neutral compound is zero.4.for alkali metal O.N is +1 nd for alkali earth metal it is +2.5.usually oxygen O.N of -2 but for peroxides it is -1 nd for superperoxides it is +1.6.for halogens O.N is always -1.

Answer 2

The convention is that the cation is written first in a formula, followed by the anion. ...

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

The oxidation number of a monatomic ion equals the charge of the ion. ...

The usual oxidation number of hydrogen is +1. ...

The oxidation number of oxygen in compounds is usually -2.