Which of the following expressions is correct in case of a \( \mathrm{CsCl} \) unit cell (edge l...

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Which of the following expressions is correct in case of a \( \mathrm{CsCl} \) unit cell (edge length, \( a \) )?
(a) \( r_{c}+r_{a}=a \)
(b) \( r_{c}+r_{a}=a / \sqrt{2} \)
(c) \( r_{c}+r_{a}=\sqrt{3} a / 2 \)
(d) \( r_{c}+r_{a}=a / 2 \)
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