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
Correct option (C) 546 pm
Explanation:
CaF2 = Ca2+ (in fcc structure) + F–
(at tetrahedral void)
= 4 + 8 = 12 atoms = 4 molecules
