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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 worksheet lists these outer configurations: P: 5s15s^1, Q: 4s2 4p44s^2\,4p^4, R: (n−1)d5ns1(n-1)d^5ns^1, and S: (n−2)f1(n−1)d1ns2(n-2)f^1(n-1)d^1ns^2.
Total: 5 marks

(a) Identify the block for P and Q. (2 marks)

(b) Identify the block for R and S. (2 marks)

(c) Which one is a p-block element and what is its period? (1 mark)

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cbse-chemistry-11.u3.t3-2.case.005

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