8.3—Indicate the oxidation number of an element in a compound or an ion

Be able to indicate the oxidation number of an element in a compound or an ion, using a Roman numeral.

Use —indicate the oxidation number of an element in a compound or an ion to connect the rule to the data and decision in the question.

This matters because —indicate the oxidation number of an element in a compound or an ion determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —indicate the oxidation number of an element in a compound or an ion to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —Indicate the oxidation number of an element in a compound or an ion is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.