The mass of unit cell of CaF2 (fluorite structure) corresponds to

mass of 4Ca +2 ions and 8F - ions

mass of 4Ca +2 ions and 8F - ions

mass of 8Ca +2 ions and 4F - ions

mass of 4Ca +2 ions and 8F - ions

mass of 4Ca +2 ions and 4F - ions

mass of Ca +2 ions and 2F - ions

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The mass of unit cell of CaF₂ (fluorite structure) corresponds to

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mass of 8Ca⁺² ions and 4F^- ions

mass of 4Ca⁺² ions and 8F^- ions

mass of 4Ca⁺² ions and 4F^- ions

mass of Ca⁺² ions and 2F^- ions

answer is B.

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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 ${CaF}_{2}$ ( fluorite) structure 1-unit cell contains 4Ca⁺² ions and 8F^- ions.

So, mass of unit cell of ${CaF}_{2}$ = mass of 4Ca⁺² ions and 8F^-ions

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