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The diagram below represents which kind of crystal imperfection? Na+ Cl− Na+ Cl− Na+ Cl− Cl− □ Cl− Na+ □ Na+ Na+ Cl− Na+ Cl− Na+ Cl− Cl− Na+ Cl− Na+ □ Na+

1. Interstitial defect
2. Schottky defect
3. Frenkel defect
4. Both Frenkel and Schottky defects

Correct answer: Interstitial defect

Solution

An interstitial defect occurs when extra ions occupy spaces between the regular lattice positions, which is indicated by the presence of additional Na+ or Cl− ions in the gaps of the crystal structure shown in the diagram.

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