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Select right expression for determining packing fraction (P. F.) of \( \mathrm{NaCl} \) unit cell (assume ideal), if ions along an edge diagonal are absent:
(a) P.F. \( =\frac{\frac{4}{3} \pi\left(r_{+}^{3}+r_{-}^{3}\right)}{16 \sqrt{2} r_{-}^{3}} \)
(b) P.F. \( =\frac{\frac{4}{3} \pi\left(\frac{5}{2} r_{+}^{3}+4 r_{-}^{3}\right)}{16 \sqrt{2} r_{-}^{3}} \)
(c) P.F. \( =\frac{\frac{4}{3} \pi\left(\frac{5}{2} r_{+}^{3}+r_{-}^{3}\right)}{16 \sqrt{2} r_{-}^{3}} \)
(d) P.F. \( =\frac{\frac{4}{3} \pi\left(\frac{7}{2} r_{+}^{3}+r_{-}^{3}\right)}{16 \sqrt{2} r_{-}^{3}} \)
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