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Packing Fraction and Efficiency

The structure...

Question

The structure obtained when all the tetrahedral voids are occupied at a FCC structure is of the type:

A

N a C l

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B

C s C l

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C

C a F_{2}

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D

Z n S

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Solution

The correct option is C $C a F_{2}$
The fluorite structure, in calcium fluoride, has the calcium ions in a face-centred cubic array with the fluoride ions in all (8) of the tetrahedral holes. The fluoride ions have a coordination number of 4, and the calcium ions have a coordination number of 8.

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Similar questions

In which of the following structures coordination number for cations and anions in the packed structure will be same ?

(a) $C l^{-}$ ions form fcc lattice and $N a^{+}$ ions occupy all octahedral voids of the unit cell

(b) $C a^{2 +}$ ions form fcc lattice and $F^{-}$ ions occupy all the eight tetrahedral voids of the unit cell

(c) $O^{2 -}$ ions form fcc lattice and $N a^{+}$ ions occupy all the eight tetrahedral voids of

(d) $S^{2 -}$ ions form fcc lattice and $Z n^{2 +}$ ions go into alternate tetrahedral voids of the unit cell

Q. Assertion :An important feature of Fluorite structure is that cations being large in size occupy FCC lattice points whereas anions occupy all the tetrahedral voids giving the formula unit

A B_{2}

(A: cation, B: anion). Reason: There are 6 cations and 12 anions per FCC unit cell of the Fluorite structure.

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Q. Element 'B' forms a CCP structure, and 'A' occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahedral voids. Structure of the bimetallic oxide is:

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Packing Fraction and Efficiency

Standard XII Chemistry

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