Contents
Part 2 of 2
Electrons in shells
identify
Try it yourself
Match each atom to its electronic configuration. The proton number is in brackets.
identify: name or select.
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Scope and sources
Cambridge IGCSE Chemistry 0620 · 2026–2028 v2 · Original learning materials.
Atomic structure (2.2 Core 1–6): protons, neutrons and electrons with their relative charges and masses, proton number and mass number, the electronic configuration of the first 20 elements and their ions, the full outer shell of the noble gases, and how outer-shell electrons and occupied shells match the group and the period. Isotopes and relative atomic mass, ionic bonding and the trends of the Periodic Table are left to their own modules.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus