In the structure of NaCl, each Na+ is surrounded by _ Cl- ions.
Correct answer: D. Six
- A. Four
- B. Eight
- C. Five
- D. Six
Explanation
A is incorrect as 6 electrons are present around each Na+ in a NaCl structure.B is incorrect as 6 electrons are present around each Na+ in a NaCl structureC is incorrect as 6 electrons are present around each Na+ in a NaCl structureD is correct as 6 electrons are present around each Na+ in a NaCl structure.NaCl has a cubic crystal system and a face-centered cubic crystalline structure. NaCl has four cations and four anions in a face-centered cubic unit cell.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Shape of Ionic Crystals
Ionic crystal shape depends on the regular arrangement of oppositely charged ions in a three-dimensional lattice. The topic covers coordination number, radius ratios, lattice geometry and structures such as sodium chloride, caesium chloride and zinc sulfide, which should not be confused with the molecular shapes predicted by VSEPR theory.
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