Final answer:
The oxidation number (N) for CIO₃-, the chlorate ion, is +5.
Step-by-step explanation:
The oxidation number (N) for CIO₃-, the chlorate ion, depends on the charge of the ion. In the chlorate ion, there is one extra electron compared to the neutral chlorine atom. Since chlorine (Cl) has an oxidation state of -1 in most compounds, we can calculate the oxidation state of nitrogen (N) as follows:
The oxidation state of Cl is -1.
The total oxidation state of the chlorate ion is -1.
Using the oxidation number rules, we can calculate the oxidation state of N: x + (-1)3 = -1, where x is the oxidation state of N.
Simplifying the equation, we have x - 3 = -1, and solving for x, we find that the oxidation state of N is +5.