The overall oxidation number is -2 so the average oxidation number of O is -1.
6. This is because it is a peroxide, with a structure Cr(O)(O2)2, where the nominal ligands are O2- (-2 ox.number in oxides) and O22- (-1 ox.number in peroxides) which gives the Cr an oxidation number of +6. It is sometimes called Chromium(VI) oxide peroxide.
Ru has oxidation number +8, O has oxidation number of -2
Oxidation number of chlorine is +7. oxidation number of O is -2.
The oxidation number for H is +1, and the oxidation number for O is -1.
Oxidation number of Si is +4.Oxidation number of O is -2.
6. This is because it is a peroxide, with a structure Cr(O)(O2)2, where the nominal ligands are O2- (-2 ox.number in oxides) and O22- (-1 ox.number in peroxides) which gives the Cr an oxidation number of +6. It is sometimes called Chromium(VI) oxide peroxide.
Ru has oxidation number +8, O has oxidation number of -2
Oxidation number of chlorine is +7. oxidation number of O is -2.
The oxidation number for H is +1, and the oxidation number for O is -1.
Oxidation number of Si is +4.Oxidation number of O is -2.
Oxidation number of Nb is +4. Oxidation number of O is -2.
Oxidation number of C is +3. Oxidation number of O is -2.
Oxidation number of N is +1. Oxidation number of O is -2.
Oxidation number of Ti is +2. Oxidation number of O is -2.
Oxidation number of o is -2. Oxidation number of H is +1.
Oxidation number of Se is +6. Oxidation number of O is -2.
The oxidation number of O in any elemental form (e.g. O2, O3) is zero. Typically in chemical compounds the oxidation number of O is -2 (oxide ion)