CsCl crystallises in body centred cubic lattice. If 'a' is its edge length then which of the following expression is correct?

Engineering

Chemistry

Ionic Solids and Crystal Structure

Question

$r_{{Cs}^{+}} + r_{{Cl}^{-}} = \frac{3 a}{2}$

$r_{{Cs}^{+}} + r_{{Cl}^{-}} = \sqrt{3} a$

$r_{{Cs}^{+}} + r_{{Cl}^{-}} = \frac{\sqrt{3} a}{2}$

$r_{{Cs}^{+}} + r_{{Cl}^{-}} = 3a$

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$\sqrt{3} a = 2 (r_{{Cs}^{+}} + r_{{Cl}^{-}})$