3.1—Interpret evidence for the existence of ions

Know and be able to interpret evidence for the existence of ions, limited to physical properties of ionic compounds, electron density maps and the migration of ions.

Use —interpret evidence for the existence of ions to connect the rule to the data and decision in the question.

This matters because —interpret evidence for the existence of ions determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —interpret evidence for the existence of ions to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —Interpret evidence for the existence of ions is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.