Which of the following expressions is correct in the case of a sodium chloride unit cell (edge l...

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Which of the following expressions is correct in the case of a sodium chloride unit cell (edge length \( =a \) )
\( \mathrm{P} \)
(1) \( \mathrm{r}_{\mathrm{c}}+\mathrm{r}_{\mathrm{a}}=\mathrm{a} / 2 \)
(2) \( \mathrm{r}_{\mathrm{c}}+\mathrm{r}_{\mathrm{a}}=\mathrm{a} \)
WV
(3) \( r_{c}+r_{a}=2 a \)
(4) \( r_{c}+r_{a}=2^{1 / 2} a \)
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