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IB Chemistry HL 3.1.3 Periodicity Questions

Use real exam questions to analyse periodic-property data, explain subshell and pairing exceptions, and justify trend-based predictions.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Analyse atomic- and ionic-radius, first-ionization-energy, electron-affinity and electronegativity trends across periods and down groups using effective nuclear charge and data.
  • Explain first-ionization-energy and electron-affinity deviations with sublevel energy, shielding and electron-pairing effects, including Be/B and N/O or P/S exceptions.
  • Evaluate a trend-based prediction or ranking for an atom or ion and justify it with nuclear charge, shielding, occupied energy levels, radius or electron arrangement evidence.

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Study 3.1.3—Periodicity conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 3.1.3 Periodicity Questions question 1

[Maximum number: 1]

Iron may be extracted from iron (II) sulfide, FeS.

Iron (II) sulfide, FeS, is ionically bonded.

Outline, in terms of their electronic structures, why the ionic radius of the sulfide ion is greater than that of the oxide ion.

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