2.1—The structure of an atom in terms of electrons, protons and neutrons

Know the structure of an atom in terms of electrons, protons and neutrons.

Use —the structure of an atom in terms of electrons, protons and neutrons to connect the rule to the data and decision in the question.

This matters because —the structure of an atom in terms of electrons, protons and neutrons determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —the structure of an atom in terms of electrons, protons and neutrons to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —The structure of an atom in terms of electrons, protons and neutrons is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.