\( \mathrm{KF} \) has \( \mathrm{NaCl} \) type of structure. The edge length of its unit cell ha...

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\( \mathrm{KF} \) has \( \mathrm{NaCl} \) type of structure. The edge length of its unit cell has been found to be \( 537.6 \mathrm{pm} \). The distance between \( \mathrm{K}^{+} \mathrm{F}^{-} \)in \( \mathrm{KF} \) is
(1) \( 26.88 \mathrm{pm} \)
(2) \( 268.8 \mathrm{pm} \)
(3) \( 2688 \mathrm{pm} \)
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