-1 for oxygen in peroxide
Hydrogen it depends on the other element if it is part of a compound
The oxidation number of each oxygen atom in peroxide is -1.
The oxidation number of oxygen in compounds is typically -2, unless it's a peroxide where it is -1. In KO3, the oxidation number of potassium is +1, so for the compound to be neutral, the oxidation number of oxygen would have to be -2.
Peroxide iion is a anion. O shows the -1 oxidation number.
The usual oxidation state for oxygen in a compound is -2.
Hydrogen it depends on the other element if it is part of a compound
The oxidation number of each oxygen atom in peroxide is -1.
The oxidation number of oxygen in compounds is typically -2, unless it's a peroxide where it is -1. In KO3, the oxidation number of potassium is +1, so for the compound to be neutral, the oxidation number of oxygen would have to be -2.
Peroxide iion is a anion. O shows the -1 oxidation number.
The usual oxidation state for oxygen in a compound is -2.
In the compound Co2O3 cobalt has an oxidation number of 3 while oxygen has an oxidation number is -2.
The oxidation number of oxygen in K2O2 is -1. Each oxygen atom in peroxide (O2^2-) has an oxidation number of -1.
Usually, oxygen has an oxidation of -2 (that is unless in a compound with peroxides or halogens).
The oxidation number of any free element is 0. So if it is oxygen by itself (e.g., O2) then the oxidation number/state is 0. In its compounds the oxidation number of oxygen is -2. This rule only stands if it isn't a peroxide such as H2O2 or Na2O2, in peroxide cases, the oxygen is -1.
In the compound Al₂O₃, aluminum has an oxidation number of +3, and oxygen has an oxidation number of -2. This gives a total charge of zero for the compound, as it should be electrically neutral.
-1. In simple inorganic compounds other than peroxides and superoxides, oxygen almost always has an oxidation number of -2, but since calcium cations always have an oxidation number of +2, in this compound, the two oxygen atoms must have only -1 charge each. This compound is calcium peroxide, one of the exceptions noted above.
+1 for each Na -1 for oxygen (as it is peroxide)