LuduminaAT-01 · AT-U1 · Planned
Atoms, ions and isotopes
Learning objectives
Use atomic notation to count protons/neutrons/electrons; distinguish isotopes/ions; describe electron energy-level changes.
8463 §§4.4.1.1–4.4.1.2 / 8464 §§6.4.1.1–6.4.1.2
DfE single-science pp.43–44 / Combined pp.35–36. Evidence checked 30 September–1 October 2026. Skills: WS1.2,4.4; MS1b,3c.
Needs firstP0 standard form; PM-01
Explanation
Atomic number identifies protons; mass number counts protons plus neutrons. Isotopes differ in neutron count, while ions differ in electron count. Electromagnetic absorption can move an electron to a higher level; emission accompanies movement to a lower level in the GCSE model.
Concepts, equations and units: Atom radius about 10⁻¹⁰ m; nucleus less than 1/10,000 radius; Z protons,A nucleons; electron charge negative; radiation absorption/emission alters levels.
Prediction, demonstration and game exercise
Predict, observe, explain
Build labelled atomic diagrams with scale disclaimer; remove an electron versus change neutron count.
Planned learner game exercise
Assemble three isotope/ion identities and choose whether a transition absorbs or emits radiation.
Independent practice
Four particle-count questions, one size-ratio comparison and an energy-level explanation.
Original practice example · Shared
A neutral atom has Z = 6 and A = 14. Count protons, neutrons and electrons.
Show working and model answer
Working / reasoning
Protons = 6; neutrons = 14 − 6; neutral electrons = protons.
Answer
6 protons, 8 neutrons, 6 electrons.
Exit check and success criteria
Three counts correct, ion/isotope distinction and emission direction correct.
During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.
Misconceptions, practical links and mastery
Check these misconceptions
Positive ion gains protons; isotope means charged; electron paths are literal planetary orbits or scale-accurate rings.
Practical preparation
No RP; model and notation exercise.
Virtual preparation and revision only. Required hands-on activities and school records remain separate.
Proposed mastery
0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.