CIE IGCSE Chemistry

Revision Notes

3.2.2 Ionic Bonds & Lattice Structure

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Ionic Bonds between Metallic & Non-Metallic Elements

Example:  Magnesium Oxide, MgO

Magnesium Oxide dot & cross diagram, IGCSE & GCSE Chemistry revision notesDiagram showing the dot-and-cross diagram of magnesium oxide



  • Magnesium is a group 2 metal so will lose two outer electrons to another atom to have a full outer shell of electrons
  • A positive ion with the charge +2 is formed
  • Oxygen is a group 6 non-metal so will need to gain two electrons to have a full outer shell of electrons
  • Two electrons will be transferred from the outer shell of the magnesium atom to the outer shell of the oxygen atom
  • Oxygen atom will gain two electrons to form a negative ion with charge -2

Formula of ionic compound:    MgO

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The Lattice Structure of Ionic Compounds

Lattice structure

  • Lattice structure refers to the arrangement of the atoms of a substance in 3D space
  • In lattice structures, the atoms are arranged in an ordered and repeating fashion
  • The lattices formed by ionic compounds consist of a regular arrangement of alternating positive and negative ions


NaCl 3-D Structure, IGCSE & GCSE Chemistry revision notesThe lattice structure of NaCl

Author: Morgan

Morgan’s passion for the Periodic Table begun on his 10th birthday when he received his first Chemistry set. After studying the subject at university he went on to become a fully fledged Chemistry teacher, and now works in an international school in Madrid! In his spare time he helps create our fantastic resources to help you ace your exams.

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