chemistryTopic 1 · Atomic Structure and the Periodic TablePaper 1Grades 8–9
Which unknown element should be used in a new battery?
Starting scenario
Element X has isotopes of mass 63 (69%) and 65 (31%), forms X²⁺ ions and conducts as a solid. Element Y has electron structure 2,8,1 and reacts vigorously with water. A manufacturer wants a conductive material that is safer to store and easy to recycle.
You will work through 8 staged questions that build up the science you need. Then you will answer one big-picture question from memory, with no checklist to help you — and only afterwards will the full connection map be revealed.