2.8—Define first, second and third ionisation energies and understand that all ionisation energies are endothermic

Be able to define first, second and third ionisation energies and understand that all ionisation energies are endothermic.

Use —define first, second and third ionisation energies and understand that all ionisation energies are endothermic to connect the rule to the data and decision in the question.

This matters because —define first, second and third ionisation energies and understand that all ionisation energies are endothermic determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —define first, second and third ionisation energies and understand that all ionisation energies are endothermic to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —Define first, second and third ionisation energies and understand that all ionisation energies are endothermic is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.