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Learning objective

Relate ionic lattice strength to charge and ionic radius.

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Topic

Bonding

Subtopic

Ionic bonding

Aqa A Level ChemistryPhysical chemistry

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Quick explanation

Relate ionic lattice strength to charge and ionic radius

  • This point belongs to Bonding, especially Ionic bonding.
  • You need to be able to relate ionic lattice strength to charge and ionic radius.
  • The key ideas to know are lattice and ion.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

latticeion

Why it matters

This objective helps connect Ionic bonding to exam-style questions, flashcards, and revision notes for Bonding.

Quick student answer

Which of the following factors will increase the lattice energy of an ionic solid?

Direct answer

A higher magnitude of charge on the ions

Key terms

  • Lattice energy: The energy released when gaseous ions combine to form one mole of an ionic solid; a measure of ionic bond strength.
  • Born–Landé equation: A quantitative expression for lattice energy: U = -(N_A·M·z⁺·z⁻·e²)/(4πϵ₀·r₀)(1-1/n), linking charge, radius, Madelung constant, and Born exponent.

Common trap

Confusing lattice energy with hydration energy: Clarify that lattice energy is a property of the solid lattice, whereas hydration energy is the energy released when ions are solvated in a solvent.

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