the answer is -2.
Related Information:
The oxidation number of oxygen when it appears as an element is 0. The oxidation number in all compounds but peroxides is -2. The oxidation number of oxygen in peroxides is -1.
Oxygen usually has an oxidation number of -2. However in certain compounds such as peroxides and superoxides, it may have an oxidation number of -1.
Atomic oxygen has oxidation number 0. Molecular oxygen also has 0 as oxidation number. It would be the same for five oxygen molecules as well.
the most common oxidation number for oxygen is -2.
It is a neutral oxide. Oxygen shows -2 oxidation number.
Oxidation number of Li is +1. Oxidation number of oxygen is -2.
In FeO the oxidation number of iron is 2+ and the oxidation number of oxygen is 2-.
The oxidation number of oxygen is -2 in most of its compounds
In the compound Co2O3 cobalt has an oxidation number of 3 while oxygen has an oxidation number is -2.
Atomic oxygen has oxidation number 0. Molecular oxygen also has 0 as oxidation number. It would be the same for five oxygen molecules as well.
Silicon's oxidation number is +4.Oxygen's oxidation number is -2
Hydrogen's oxidation number is +1.Chlorin's oxidation number is +1.Oxygen's oxidation number is -2.
the most common oxidation number for oxygen is -2.
It is a neutral oxide. Oxygen shows -2 oxidation number.
In FeO the oxidation number of iron is 2+ and the oxidation number of oxygen is 2-.
in NiO2 the oxidation number for Ni is 4+ and the oxidation number for oxygen is 2-.
Oxidation number of Li is +1. Oxidation number of oxygen is -2.
Usually the oxidation no of oxygen is -2 and the oxidation no of hydrogen is +1 in a compound.
Oxygen pretty much always has an oxidation number of -2 (there are few exceptions.) A better question is "What is arsenic's oxidation number in this ion?" It would be +5.