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Given that interionic distance in \( \mathrm{Na}^{+} \mathrm{F}^{-} \)crystal is \( 2.31 \AA \)
\( \mathrm{P} \) and \( r_{F^{-}}=1.36 \AA \), which of the following predictions

WV will be right
(A) \( \mathrm{r}_{\mathrm{Na}^{+}} / \mathrm{r}_{\mathrm{F}^{-}} \approx 0.7 \)
(B) coordination number of \( \mathrm{Na}^{+}= \)coordination nunber of \( \mathrm{F}^{-}=6 \)
(C) \( \mathrm{Na}^{+} \mathrm{F}^{-} \)will have rock salt type crystal structure
(D) effective nuclear charge for \( \mathrm{Na}^{+} \)and \( \mathrm{F}^{-} \)are equal
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