GCSE Combined Science (AQA)

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Limitations of Covalent Bonding Models

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

Limitations of Covalent Bonding Models

4:51 Covalent Bonding and Simple Covalent Structure Properties
Spec 4.2.1.4
Previous Properties of Small Molecules Next The Particle Theory
  • Various methods exist to represent simple molecules and giant covalent structures.
  • 2D diagrams use letters and lines to represent atoms and bonds.
  • 3D ball and stick models and dot and cross diagrams show electrons in circular shells.
  • Dot and cross diagrams help visualize the origin of bonding electrons.
  • Dot and cross diagrams show the ratio and identity of atoms in a compound.
  • Limitation: Dot and cross diagrams do not show the 3D arrangement of atoms.
  • Limitation: Dot and cross diagrams do not accurately reflect the real size of atoms.
  • 2D diagrams are easy to draw and show how atoms are bonded.
  • Limitation: 2D diagrams do not show the 3D arrangement of atoms.
  • 3D ball and stick models and diagrams show the spatial arrangement of atoms.
  • Limitation: 3D models do not show electrons involved in bonding.
  • Limitation: Sticks in 3D models do not accurately represent bonds.
  • Limitation: Atoms in 3D models are placed too far apart, not reflecting true distances.

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