Long answer·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
Compare Mendeleev's periodic law with the modern periodic law. Use the comparison to explain why the modern table handles anomalous mass pairs better.
Total: 5 marks
(a) State Mendeleev's periodic law. (1 mark)
(b) State the modern periodic law. (1 mark)
(c) Explain the argon-potassium type anomaly using atomic number. (3 marks)
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