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Question

In the NaCl (Rock salt) structure, what would be the distance for the nearest cation (Na+) from an anion (Cl−) ?
Here a is the edge cell length.

A
a4
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B
a2
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C
a2
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D
a
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Solution

The correct option is B a2
In the NaCl (Rock salt) structure,
Cl ions form the FCC lattice,while Na+ ions occupy all the octahedral voids.


For an anion Cl,
Distance of the nearest cation Na+ will be a2.
This is the distance from the corner atom Cl to the edge atom Na+
Option (b) is correct.
Number of nearest cations are 6
Nearest anion-anion distance is a2
This is the distance between face centre and corner atoms.
In a rock salt NaCl structure:
Effective number of Cl ions in each unit cell are 4
Effective number of Na+ ions in each unit cell are 4
Effective total number of NaCl units in a unit cell are 4



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