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Q.

The unit cube length for LiCl (NaCl structure) is 5.14 A°. Assuming anion-anion contact, calculate the ionic radius for chloride ion in A°.

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answer is 1.82.

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Detailed Solution

In such a unit cell face diagonally in 4 times the radius of the anion (as shown in the figure). 

2a=4r−

r−=24×5.14 A∘ r−=1.82 A∘

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