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
A teacher gives four configurations: A: , B: , C: , and D: as the characteristic outer parts of four elements.
Total: 5 marks
(a) Which configuration represents a noble gas? (1 mark)
(b) Which configurations represent s-block and p-block elements? (2 marks)
(c) Which configuration represents a d-block element and why? (2 marks)
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