8.9—Metals, in general, form positive ions by loss of electrons with an increase in oxidation number whereas non-metals

Understand that metals, in general, form positive ions by loss of electrons with an increase in oxidation number whereas non-metals, in general, form negative ions by gain of electrons with a decrease in oxidation number.

Use —metals, in general, form positive ions by loss of electrons with an increase in oxidation number whereas non-metals to connect the rule to the data and decision in the question.

This matters because —metals, in general, form positive ions by loss of electrons with an increase in oxidation number whereas non-metals determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —metals, in general, form positive ions by loss of electrons with an increase in oxidation number whereas non-metals to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —Metals, in general, form positive ions by loss of electrons with an increase in oxidation number whereas non-metals is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.