What this tests
Syllabus point 2.2 — Atomic structure and the Periodic Table, in Atoms, elements and compounds. Difficulty easy (estimated from the question's demands, not a Cambridge rating).
Cambridge IGCSE Chemistry 0620 · 2.2 Atomic structure and the Periodic Table
June 2017 · Paper 22 · Question 4
One real Cambridge question from Atoms, elements and compounds, with the official answer.