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Question

The edge length of sodium chloride unit cell is 564 pm. The size of Cl− ions is 181 pm. The size of Na+ ions will be :

A
101 pm
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B
181 pm
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C
410 pm
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D
202 pm
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Solution

The correct option is A 101 pm
From the above structure, it is clear that
Length of edge of unit cell=RCl+2RNa++RCl

564=2RNa++2×181
RNa+=5643622=101 pm

Hence, Option "A" is the correct answer.

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