Year 12 topic · full A-level standard · AQA + OCR A
A-level periodicity exam questions
Practise Periodicity at full A-level standard: trends and exceptions, ionisation-energy data, Period 3 melting points and structure, and sample student answers that may be correct, incomplete or contain an error.
In this mode, you mark sample answers, check the reasoning and choose corrections. Some answers already deserve full marks.
For marking practice across bonding and equilibria, mark an A-level candidate answer.
Generated Periodicity set
Mark sample answers or choose direct Periodicity questions. Check the feedback after each part.
The board boundaries matter
AQA focuses its Periodicity section on block classification and Period 3 trends in atomic radius, first ionisation energy and melting point. OCR A goes further here: Periods 2 and 3 electron configurations, first and successive ionisation energies, the characteristic small decreases in first ionisation energy, giant metallic and giant covalent structures, and melting-point patterns across Periods 2 and 3. The generator keeps those scopes separate.
The candidate answers are deliberately plausible. Some contain one subtle chemical error or omit one link in the reasoning; some deserve full marks. You cannot assume every answer has been sabotaged.