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
Explain Aufbau principle, Pauli exclusion principle and Hund's rule using the filling of oxygen atom, .
Total: 5 marks
(a) Write oxygen configuration. (2 marks)
(b) Name how Aufbau is used. (1 mark)
(c) Name how Pauli principle is used. (1 mark)
(d) Name how Hund's rule is used. (1 mark)
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