Chloride ions in NaCl are placed at the corner of a regular:
Correct answer: C. Octahedron
- A. Pentagon
- B. Cuboid
- C. Octahedron
- D. Cube
Explanation
Chloride ions are placed in a CCP type of arrangement. It contains chloride ions at the corner and the center of the cube. 6 chloride ions surround one sodium atom. So, The location of Na+ and Cl- is such that each Na+ is surrounded by six Cl- ions placed at the corners of a regular octahedron.
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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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