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KF crystallizes in the NaCl type structure. If the radius of K^+ ions 132 pm and that of F^– ion is 135 pm,

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KF crystallizes in the NaCl type structure. If the radius of K+ ions 132 pm and that of F– ion is 135 pm, what is the shortest K- F distance? What is the edge length of the unit cell? What is the closet K-K distance?

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Analyzing one edge of FCC (KF) structure 2(r++ r– ) = a

r++ r– = shortest KF – distance = 132 + 135 = 267 pm 

a = 534 pm

Closest K – K distance 

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