Atomic structure and the Periodic Table

Chemistry · IGCSE · Cambridge · Cambridge IGCSE (9–1) Chemistry 0971 (Extended) (2026–2028) · Specification point · 2.2 · Atoms, elements and compounds

Structure of the atom

Atomic number and mass number

Electronic configurations of atoms and ions

Electron shells and periodic-table position

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Learning Objectives

2.2 Atomic structure and the Periodic Table

Core	Supplement
$1 Describe the structure of the atom as a central nucleus containing neutrons and protons surrounded by electrons in shells$
$2 State the relative charges and relative masses of a proton, a neutron and an electron$
$3 Define proton number/atomic number as the number of protons in the nucleus of an atom$
$4 Define mass number/nucleon number as the total number of protons and neutrons in the nucleus of an atom$
$5 Determine the electronic configuration of elements and their ions with proton number 1 to 20, e.g. 2,8,3$

Atomic structure and the Periodic Table (2.2) | Cambridge IGCSE (9–1) Chemistry 0971 (Extended) (2026–2028) | KnowledgeSet