Elemntal argon has an oxidation number of zero. The only compound known (aunstable and only very small amounts made at low temperature) HArF has an oxidation number of zero also!
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The oxidation number of nitrogen in the nitrate ion NO3- is 5
oxidation number
A molecule of a compound must be electrically neutral overall. There is only one y atom in the formula, so that the total contribution of charge from y is +2. There are two x atoms, and each of them must have an oxidation number of -1 for a total of -2 to neutralize the charge from y.
The Roman numeral in the parentheses is the valence or oxidation of the metal that it follows. Transition elements have more than one oxidation number
it's the italian code of the manifacturer, AR is the city of Arezzo and 272 a progressive number assigned uniquely to a manifacturer