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Periodicity: AQA A‑Level Chemistry questions

Every AQA A-Level Chemistry exam question on 3.2.1 Periodicity, 2016–2025, with its mark scheme and examiner’s report.

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2,301 questions

  1. Q15

    June 2025 · Paper 3

    1 mark3.2.1 Periodicity
    The whole paper ↗
    June 2025 Paper 3, question 15: Which statement about trends from left to right across Period 3 is correct? [1 mark] A Atomic radius increases from Na to Si and then decreases B Atomic radius

  2. Q16

    June 2025 · Paper 3

    1 mark3.2.1 Periodicity
    The whole paper ↗
    June 2025 Paper 3, question 16: Which statement about ionisation energies in Period 3 is not correct? [1 mark] A The first ionisation energy of Mg is greater than that of Na B The first ionisa

  3. Q19

    June 2024 · Paper 3

    1 mark3.2.1 Periodicity
    The whole paper ↗
    June 2024 Paper 3, question 19: Consider the Period 3 elements from sodium to chlorine. Which statement is correct? [1 mark] A Sodium has the smallest atomic radius. B Aluminium has the highes

  4. Q16

    June 2024 · AS Paper 1

    1 mark3.2.1 Periodicity
    The whole paper ↗
    June 2024 AS Paper 1, question 16: Which row correctly shows general trends in properties across Period 3? [1 mark] Atomic radius First ionisation energy A decreases increases B decreases decreas

  5. Q19

    June 2023 · Paper 3

    1 mark3.2.1 Periodicity
    The whole paper ↗
    June 2023 Paper 3, question 19: Which statement is not correct about the Period 3 elements sodium to chlorine? [1 mark] A Sodium has the largest atomic radius. B Sodium has the lowest melting

  6. Q20

    June 2022 · AS Paper 1

    1 mark3.2.1 Periodicity
    The whole paper ↗
    June 2022 AS Paper 1, question 20: Which block in the Periodic Table contains the element samarium (Sm)? [1 mark] A d block B f block C p block D s block

  7. Q03.6

    November 2021 · Paper 1

    1 mark3.2.1 Periodicity
    The whole paper ↗
    November 2021 Paper 1, question 03.6: Identify the element in Period 3, from sodium to chlorine, that has the largest atomic radius. [1 mark]

  8. Q17

    November 2021 · AS Paper 1

    1 mark3.2.1 Periodicity
    The whole paper ↗
    November 2021 AS Paper 1, question 17: Which element is classified as a d block element? [1 mark] A Antimony B Molybdenum C Strontium D Uranium

  9. Q18

    November 2021 · AS Paper 1

    1 mark3.2.1 Periodicity
    The whole paper ↗
    November 2021 AS Paper 1, question 18: Which element in Period 3 has the highest melting point? [1 mark] A Aluminium B Silicon C Sodium D Sulfur

  10. Q03.3

    November 2020 · Paper 1

    2 marks3.2.1 Periodicity
    The whole paper ↗
    November 2020 Paper 1, question 03.3: Explain why the atomic radius decreases across Period 3, from sodium to chlorine. [2 marks]

  11. Q03.4

    November 2020 · Paper 1

    1 mark3.2.1 Periodicity
    The whole paper ↗
    November 2020 Paper 1, question 03.4: Identify the element in Period 3, from sodium to chlorine, that has the highest electronegativity. [1 mark]

  12. Q01.1

    November 2020 · AS Paper 1

    3 marks3.2.1 Periodicity
    The whole paper ↗
    November 2020 AS Paper 1, question 01.1: There is a general trend for an increase in ionisation energy across Period 3. Give one example of an element that deviates from this trend. Explain why this de

  13. Q03.1

    June 2019 · Paper 1

    1 mark3.2.1 Periodicity
    The whole paper ↗
    June 2019 Paper 1, question 03.1: State the meaning of the term periodicity. [1 mark]

  14. Q03.2

    June 2019 · Paper 1

    1 mark3.2.1 Periodicity
    The whole paper ↗
    June 2019 Paper 1, question 03.2: Identify the element in Period 4 with the highest electronegativity value. [1 mark]

  15. Q03.3

    June 2019 · Paper 1

    3 marks3.2.1 Periodicity
    The whole paper ↗
    June 2019 Paper 1, question 03.3: Identify the element in Period 4 with the largest atomic radius. Explain your answer. [3 marks] Element Explanation

  16. Q17

    June 2018 · Paper 3

    1 mark3.2.1 Periodicity
    The whole paper ↗
    June 2018 Paper 3, question 17: Which of these Period 3 elements has the highest melting point? [1 mark] A Aluminium B Phosphorus C Sodium D Sulfur

  17. Q12

    June 2018 · AS Paper 1

    1 mark3.2.1 Periodicity
    The whole paper ↗
    June 2018 AS Paper 1, question 12: The diagram shows how a property of Period 3 elements varies across the period. What is the property? [1 mark] A Atomic radius B Electronegativity C First ionis

  18. Q18

    June 2018 · AS Paper 1

    1 mark3.2.1 Periodicity
    The whole paper ↗
    June 2018 AS Paper 1, question 18: Which element has the highest first ionisation energy? [1 mark] A Aluminium B Phosphorus C Silicon D Sulfur

  19. Q06

    June 2017 · Paper 3

    1 mark3.2.1 Periodicity
    Mark scheme (PDF)
    The whole paper ↗
    June 2017 Paper 3, question 06: Which is the correct order of melting points of these Period 3 elements? [1 mark] A phosphorus > sulfur > chlorine > argon B argon > chlorine > phosphorus > sul

  20. Q01.3

    June 2017 · AS Paper 1

    3 marks3.2.1 Periodicity
    The whole paper ↗
    June 2017 AS Paper 1, question 01.3: State which of the elements magnesium and aluminium has the lower first ionisation energy. Explain your answer. [3 marks
All 25 questions on Periodicity, as a list
  1. June 2025, Paper 3, Q15 (1 mark): Which statement about trends from left to right across Period 3 is correct? [1 mark] A Atomic radius increases from Na to Si and then decreases B Atomic radius
  2. June 2025, Paper 3, Q16 (1 mark): Which statement about ionisation energies in Period 3 is not correct? [1 mark] A The first ionisation energy of Mg is greater than that of Na B The first ionisa
  3. June 2024, Paper 3, Q19 (1 mark): Consider the Period 3 elements from sodium to chlorine. Which statement is correct? [1 mark] A Sodium has the smallest atomic radius. B Aluminium has the highes
  4. June 2024, AS Paper 1, Q16 (1 mark): Which row correctly shows general trends in properties across Period 3? [1 mark] Atomic radius First ionisation energy A decreases increases B decreases decreas
  5. June 2023, Paper 3, Q19 (1 mark): Which statement is not correct about the Period 3 elements sodium to chlorine? [1 mark] A Sodium has the largest atomic radius. B Sodium has the lowest melting
  6. June 2022, AS Paper 1, Q20 (1 mark): Which block in the Periodic Table contains the element samarium (Sm)? [1 mark] A d block B f block C p block D s block
  7. November 2021, Paper 1, Q03.6 (1 mark): Identify the element in Period 3, from sodium to chlorine, that has the largest atomic radius. [1 mark]
  8. November 2021, AS Paper 1, Q17 (1 mark): Which element is classified as a d block element? [1 mark] A Antimony B Molybdenum C Strontium D Uranium
  9. November 2021, AS Paper 1, Q18 (1 mark): Which element in Period 3 has the highest melting point? [1 mark] A Aluminium B Silicon C Sodium D Sulfur
  10. November 2020, Paper 1, Q03.3 (2 marks): Explain why the atomic radius decreases across Period 3, from sodium to chlorine. [2 marks]
  11. November 2020, Paper 1, Q03.4 (1 mark): Identify the element in Period 3, from sodium to chlorine, that has the highest electronegativity. [1 mark]
  12. November 2020, AS Paper 1, Q01.1 (3 marks): There is a general trend for an increase in ionisation energy across Period 3. Give one example of an element that deviates from this trend. Explain why this de
  13. June 2019, Paper 1, Q03.1 (1 mark): State the meaning of the term periodicity. [1 mark]
  14. June 2019, Paper 1, Q03.2 (1 mark): Identify the element in Period 4 with the highest electronegativity value. [1 mark]
  15. June 2019, Paper 1, Q03.3 (3 marks): Identify the element in Period 4 with the largest atomic radius. Explain your answer. [3 marks] Element Explanation
  16. June 2018, Paper 3, Q17 (1 mark): Which of these Period 3 elements has the highest melting point? [1 mark] A Aluminium B Phosphorus C Sodium D Sulfur
  17. June 2018, AS Paper 1, Q12 (1 mark): The diagram shows how a property of Period 3 elements varies across the period. What is the property? [1 mark] A Atomic radius B Electronegativity C First ionis
  18. June 2018, AS Paper 1, Q18 (1 mark): Which element has the highest first ionisation energy? [1 mark] A Aluminium B Phosphorus C Silicon D Sulfur
  19. June 2017, Paper 3, Q06 (1 mark): Which is the correct order of melting points of these Period 3 elements? [1 mark] A phosphorus > sulfur > chlorine > argon B argon > chlorine > phosphorus > sul
  20. June 2017, AS Paper 1, Q01.3 (3 marks): State which of the elements magnesium and aluminium has the lower first ionisation energy. Explain your answer. [3 marks
  21. June 2017, AS Paper 1, Q21: Which of these has the highest first ionisation energy? [1 mar A Na B Al C Si D Cl
  22. June 2016, AS Paper 1, Q02.3 (4 marks): The first ionisation energies of some Period 3 elements are shown in Figure 1. Figure 1 Complete Figure 1 by plotting the approximate first ionisation energy va
  23. June 2016, AS Paper 1, Q10: Which element is in the d-block of the Periodic Table? [1 mar A Selenium B Antimony C Tantalum D Lead
  24. Specimen, Paper 1, Q02.1 (2 marks): Explain why the atomic radii of the elements decrease across Period 3 from sodium t chlorine. [2 mark 0 2 . 1
  25. Specimen, Paper 1, Q02.2 (2 marks): Explain why the melting point of sulfur (S8) is greater than that of phosphorus (P4). [2 mark 0 2 . 2

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