Water, or H2O is a free-standing neutral compound, so it's oxidation number is 0. Its atoms have oxidation number though. Hydrogen's oxidation number in water is +1, and oxygen's is -2.
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The oxidation number of oxygen in H2O is -2. Oxygen typically has an oxidation number of -2 in most compounds, unless it is in a peroxide where it has an oxidation number of -1.
H - +1 (oxidation number)
O - -2 (oxidation number)
2*(+1)+(-2)=0
H2O is neutral (if that's what you want)
-2
The oxide ion always has an oxidation number of -2 except for in peroxides when it is -1.
The oxidation number of oxygen is typically -2. However, in certain compounds like peroxides where oxygen is in a -1 oxidation state, or in compounds where oxygen is bonded to fluorine where it can have positive oxidation states, the oxidation number of oxygen can vary.
The oxidation number of oxygen in OF2 is 2.
The oxidation number of oxygen when combined with fluorine is -1. Oxygen usually has an oxidation number of -2, but when combined with a more electronegative element like fluorine, oxygen's oxidation number becomes -1.
The usual oxidation number of oxygen is -2, while the usual oxidation number of hydrogen is +1.
The oxidation number of oxygen in OF2 is +2. Oxygen usually has an oxidation number of -2, but in this case, since there are two fluorine atoms each with an oxidation number of -1, the oxidation number of oxygen must be +2 to balance the overall charge.