FRQ — Structure of Atom

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

Three species are given:

\mathrm{Na^+}

\mathrm{Mg^{2+}}

and

\mathrm{Al^{3+}}

. Their atomic numbers are

11

12

and

13

respectively.

Total: 5 marks

(a) Find the number of electrons in each species. (2 marks)

(b) Write their common electronic configuration. (2 marks)

Your response (optional — you can also work on paper)

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