Periodic Trends Practice Questions (PDF) | WJEC A-Level Chemistry

WJEC Okay, here are 20 multiple-choice questions speci cally focused on *trends* in the periodic table, based on the WJEC A-Level Chemistry document "1.6 The Periodic Table": Questions: 1. What is the general trend in atomic radius across Period 3 (from Na to Ar)? 2. What is the primary reason for...

WJEC Okay, here are 20 multiple-choice questions speci cally focused on *trends* in the periodic table, based on the WJEC A-Level Chemistry document "1.6 The Periodic Table": Questions: 1. What is the general trend in atomic radius across Period 3 (from Na to Ar)? 2. What is the primary reason for the trend in atomic radius across a period? 3. What is the general trend in atomic radius down a group? 4. What is the primary reason for the trend in atomic radius down a group? 5. What is the general trend in rst ionisation energy across Period 3 (from Na to Ar)? 6. What is the primary reason for the general trend in rst ionisation energy across a period? 7. What is the general trend in rst ionisation energy down a group? 8. What is the primary reason for the trend in rst ionisation energy down a group? 9. What is the general trend in electronegativity across a period? 10. What is the general trend in electronegativity down a group? 11. What is the trend in melting points down Group 1? 12. What is the primary reason for the trend in melting points down Group 1? 13. What is the trend in melting points down Group 2? 14. What is the primary reason for the trend in melting point down group 2? 15. What is the trend in melting points down Group 7? 16. What is the primary reason for the trend in melting points down Group 7? 17. What is the trend in reactivity of Group 1 elements down the group? 18. What is the trend in reactivity of group 7 elements down the group? 19. What is the trend in thermal stability of Group 2 carbonates down the group? 20. What is the general trend in the solubility of Group 2 sulfates down the group? Answers and Brief Explanations: fi fi fi fi fi 1. Decreases. 2. Increasing nuclear charge with similar shielding. 3. Increases. 4. Increasing number of occupied electron shells (increased shielding). 5. Generally increases (with some exceptions). 6. Increasing nuclear charge and similar shielding. 7. Decreases. 8. Increased atomic radius and increased shielding, weakening the attraction between the nucleus and outer electron. 9. Increases. 10. Decreases. 11. Decreases. 12. Increasing ionic radius weakens the metallic bonding (same charge, larger ion). 13. Decreases. 14. Increasing ionic radius weakens the metallic bonding (same charge, larger ion). 15. Increases. 16. Increasing number of electrons leads to stronger induced dipole-dipole (van der Waals) forces. 17. Increases. They become more easily oxidized (lose electrons more readily). 18. Decreases. 19. Increases. 20. Decreases. Provide multiple choice answers for the questions. Okay, here are the multiple-choice options for the 20 questions on periodic trends: 1. What is the general trend in atomic radius across Period 3 (from Na to Ar)? a) Increases b) Decreases c) Remains constant d) Increases, then decreases Answer: b) Decreases 2. What is the primary reason for the trend in atomic radius across a period? a) Increasing number of electron shells b) Decreasing nuclear charge c) Increasing nuclear charge with similar shielding d) Decreasing number of electron shells Answer: c) Increasing nuclear charge with similar shielding 3. What is the general trend in atomic radius down a group? a) Increases b) Decreases c) Remains constant d) Decreases, then increases Answer: a) Increases 4. What is the primary reason for the trend in atomic radius down a group? a) Decreasing nuclear charge b) Increasing nuclear charge c) Increasing number of occupied electron shells (increased shielding) d) Decreasing number of occupied electron shells Answer: c) Increasing number of occupied electron shells (increased shielding) 5. What is the general trend in rst ionisation energy across Period 3 (from Na to Ar)? a) Generally increases (with some exceptions) b) Generally decreases (with some exceptions) c) Remains constant d) Increases, then decreases Answer: a) Generally increases (with some exceptions) 6. What is the primary reason for the general trend in rst ionisation energy across a period? a) Decreasing nuclear charge fi fi b) Increasing number of electron shells c) Increasing nuclear charge and similar shielding d) Decreasing number of electron shells Answer: c) Increasing nuclear charge and similar shielding 7. What is the general trend in rst ionisation energy down a group? a) Increases b) Decreases c) Remains constant d) Decreases, then increases Answer: b) Decreases 8. What is the primary reason for the trend in rst ionisation energy down a group? a) Decreasing nuclear charge b) Decreasing atomic radius c) Increased atomic radius and increased shielding d) Decreasing shielding Answer: c) Increased atomic radius and increased shielding 9. What is the general trend in electronegativity across a period? a) Increases b) Decreases c) Remains constant d) Increases, then decreases Answer: a) Increases 10. What is the general trend in electronegativity down a group? a) Increases b) Decreases c) Remains constant d) Decreases, then increases Answer: b) Decreases 11. What is the trend in melting points down Group 1? fi fi a) Increases b) Decreases c) Remains constant d) Increases, then decreases Answer: b) Decreases 12. What is the primary reason for the trend in melting points down Group 1? a) Decreasing ionic radius b) Increasing ionic radius, weakening metallic bonding c) Increasing electronegativity d) Decreasing number of electron shells Answer: b) Increasing ionic radius, weakening metallic bonding 13. What is the trend in melting points down Group 2? a) Increases b) Decreases c) Remains constant d) Increases, then decreases Answer: b) Decreases 14. What is the primary reason for the trend in melting point down group 2? a) Decreasing ionic radius b) Increasing ionic radius, weakening metallic bonding c) Increasing electronegativity d) Decreasing number of electron shells Answer: b) Increasing ionic radius, weakening metallic bonding 15. What is the trend in melting points down Group 7? a) Increases b) Decreases c) Remains constant d) Decreases, then increases Answer: a) Increases 16. What is the primary reason for the trend in melting points down Group 7? a) Decreasing number of electrons b) Increasing number of electrons, leading to stronger induced dipole- dipole forces c) Increasing nuclear charge d) Decreasing atomic radius Answer: b) Increasing number of electrons, leading to stronger induced dipole-dipole forces 17. What is the trend in reactivity of Group 1 elements down the group? a) Increases b) Decreases c) Remains constant d) No clear trend Answer: a) Increases 18. What is the trend in reactivity of group 7 elements down the group? a) Increases b) Decreases c) Remains constant d) No clear trend Answer: b) Decreases 19. What is the trend in thermal stability of Group 2 carbonates down the group? a) Increases b) Decreases c) Remains constant d) No clear trend Answer: a) Increases 20. What is the general trend in the solubility of Group 2 sulfates down the group? a) Increases b) Decreases c) Remains constant d) No clear trend Answer: b) Decreases