If ionic radius of Cs+ and Cl- are 1.69 Ao and 1.81 Ao respectively, the edge length of unit cell is_ in same units(Round off to nearest integer)

If ionic radius of Cs⁺ and Cl^- are 1.69 $\overset{o}{A}$ and 1.81 $\overset{o}{A}$ respectively, the edge length of unit cell is_ in same units
(Round off to nearest integer)

Solution:

$\begin{array}{l} 2 (r^{+} + r^{-}) = \sqrt{3} a \\ 2 (1 .69 + 1 .81) = \sqrt{3} a \\ 2 \times 3 .5 = \sqrt{3} a \Rightarrow 7 = \sqrt{3} a \\ a = \frac{7}{\sqrt{3}} = 4 .04 \overset{o}{A} \end{array}$

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