Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
Elements A, B and C are in the same period from left to right. Their atomic radii decrease in the order A > B > C.
Total: 5 marks
(a) Which has highest ionisation enthalpy? (1 mark)
(b) Which is most metallic? (1 mark)
(c) Which is most electronegative? (1 mark)
(d) Give the common reason behind these trends. (2 marks)
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