Lesson Plan

• State the relative charge of a proton, neutron, and electron.
• State the relative mass of each sub‑atomic particle.
• Compare the electron’s mass to that of a proton/neutron using the 1/1836 ratio.
• Explain why these values are essential for balancing equations and calculating atomic mass.

• Projector or interactive whiteboard
• Printed worksheet with particle tables
• Model atoms (ball‑and‑stick) or diagram handouts
• Whiteboard and markers
• Exit‑ticket cards

Begin by asking students what makes an atom “heavy” or “charged” to spark curiosity. Review that atoms consist of protons, neutrons, and electrons, which they have studied previously. Explain that by the end of the lesson they will be able to state each particle’s relative charge and mass.

1. Do‑now (5 min): Quick quiz on basic atomic structure to activate prior knowledge.
2. Mini‑lecture (10 min): Present the charge and mass table; explain the significance of each value.
3. Guided practice (10 min): Students complete a worksheet filling missing charge/mass values.
4. Interactive activity (10 min): Use model atoms to visualise charges and compare masses.
5. Check for understanding (5 min): Kahoot quiz or exit‑ticket question summarising the objectives.

Recap the four key objectives, confirming that students can now state each particle’s relative charge and mass. Collect exit‑ticket responses to gauge individual understanding. Assign homework: complete a worksheet applying these values to calculate isotopic masses.