IB Chemistry HL 3.1.3 Periodicity and electron-structure explanations Question Bank

Practise IB Chemistry HL 3.1.3 by analysing periodic trends and explaining exceptions with detailed electron-structure reasoning.

Exam points

Analyse competing effects of nuclear charge, shielding and electron configuration across a period.
Explain an ionization-energy or electron-affinity exception using sublevel energy and electron pairing.
Evaluate a predicted trend against data and identify the structural reason for any deviation.

[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.

«valence» electrons further from nucleus/extra electron shell/ electrons in third/3s/3p level «not second/2s/2p»

Marking guidance:

Accept 2,8 (for $\mathrm{O}^{2-}$ ) and 2,8,8 (for $\mathrm{S}^{2-}$ )

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