The mass of unit cell of CaF2 (fluorite structure) corresponds to
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a
mass of 8Ca+2 ions and 4F- ions
b
mass of 4Ca+2 ions and 8F- ions
c
mass of 4Ca+2 ions and 4F- ions
d
mass of Ca+2 ions and 2F- ions
answer is B.
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Detailed Solution
CaF2 has ccp arrangement in which calcium ions form fcc with each calcium ion surrounded by 8 F_ and each fluoride ion by 4 Ca+2 ions.Fluoride ions occupy all the tetrahedral voids.In CaF2 ( fluorite) structure 1-unit cell contains 4Ca+2 ions and 8F- ions. So, mass of unit cell of CaF2 = mass of 4Ca+2 ions and 8F- ions