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The density of the CaF2 (fluorite structure) is 3.18 g/cm^3 . The length of the side of the unit cell is

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The density of the CaF2 (fluorite structure) is 3.18 g/ cm3 . The length of the side of the unit cell is 

(A) 253 pm 

(B) 344 pm 

(C) 546 pm 

(D) 273 pm

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Best answer

Correct option  (C) 546 pm

Explanation:

 CaF2 = Ca2+ (in fcc structure) + F–

(at tetrahedral void)

= 4 + 8 = 12 atoms = 4 molecules

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