Particle detectives: atoms, ions and isotopes
Original BrainJoy mini-unit, prepared November 10, 2026.

Included: student PDF (2 pages), teacher notes/answer key PDF (2 pages), 12-question BrainJoy quiz JSON.
The teacher PDF and quiz JSON contain answers. Keep them separate from learner copies.
Free for your own classroom or home use and adaptation. Do not resell or redistribute as your own product.
General practice, not an official exam-board or validated assessment. Teacher review required.
No account or payment required. No personal learner data is needed.

Fact-check sources (accessed November 10, 2026):
https://openstax.org/books/chemistry-2e/pages/2-3-atomic-structure-and-symbolism
https://openstax.org/books/chemistry-2e/pages/2-6-ionic-and-molecular-compounds
Questions, activities, explanations, layout and decorative illustration are original BrainJoy work. No source images or question text have been copied. No publisher endorsement is implied.
