ConceptConceptDocsDocuments

CAIE IGCSE Chemistry Group Period and Electron Shell Rules

Practise using electronic configurations to infer an element's group and period and recognising noble gases by their complete outer electron shells.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • infer a Group I to VII number from the number of electrons in the atom's outer shell
  • infer the period from the number of occupied electron shells in the atom's configuration
  • recognise a noble gas from a complete outer shell and connect this arrangement with stability

2.2.6—Periodic table shell rules: (a) Group question 1

[Maximum number: 1]

The symbols of the elements of Period 3 of the Periodic Table are shown.

Table for Question 2.2.6—Periodic table shell rules: (a) Group question 1 — CAIE IGCSE Chemistry

Answer the following questions about these elements.
Each element may be used once, more than once or not at all.
Write the symbol of an element which:

has only two electrons in its outermost shell

All question bank results loaded