GCSE Combined Science (AQA)

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Representing Ionic Structure

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Bonding, structure, and the properties of matter Chemical bonds, ionic, covalent and metallic

Representing Ionic Structure

3:26 Ionic Bonding Diagrams
Spec 4.2.1.3
Previous Advanced Ionic Bonding Diagrams Next Limitations of Model Diagrams
  • Ionic compounds can be represented using different models and diagrams.
  • Dot and cross diagrams show electrons in circular shells using dots and crosses.
  • Ball and stick models represent ions as balls connected by sticks, indicating bonds.
  • 2D diagrams show one layer of alternating positive and negative ions.
  • 3D diagrams stack multiple 2D layers to form a 3D structure.
  • All these diagrams represent giant ionic structures made up of trillions of ions.
  • Sodium chloride is an example of a giant ionic structure with a simple formula of NaCl, representing the simplest ratio.
  • An empirical formula is the smallest ratio of atoms of each element in a compound.
  • NaCl is an example of an empirical formula for sodium chloride.
  • The empirical formula of an ionic compound can be determined using a diagram of its structure.
  • Example: Manganese oxide has nine manganese ions and nine oxide ions, leading to an empirical formula of MnO.
  • Steps to determine empirical formula:
  • 1. Count the number of each type of ion.
  • 2. Simplify the ratio of ions.
  • 3. Write the empirical formula using the simplified ratio.
  • Example: A compound with 3 metal X ions and 6 oxide ions simplifies to a ratio of 1:2, resulting in an empirical formula of XO���.

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