\( \mathrm{KF} \) crystallizes in the \( \mathrm{NaCl} \) type stru...

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\( \mathrm{KF} \) crystallizes in the \( \mathrm{NaCl} \) type structure. If the radius of \( \mathrm{K}^{+} \)ions \( 132 \mathrm{pm} \) and that of \( \mathrm{F}^{-} \)ion is \( 135 \mathrm{pm} \), what is the closet \( \mathrm{K}-\mathrm{K} \) distance?
\( \mathrm{P} \)
(A) Can not say
(B) \( 534 \mathrm{pm} \)
(C) \( 755 \mathrm{pm} \)
(D) \( 378 \mathrm{pm} \)
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