FRQ — Classification of Elements and Periodicity in Properties

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 student compares the radii of three species of the same element:

X

X^+

and

X^-

. The student claims that the order must be

X^+>X>X^-

because positive charge means bigger size.

Total: 5 marks

(a) Correct the order of size. (2 marks)

(b) Explain the small size of $X^+$ . (2 marks)

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

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