Question:

6 5. (a) Give the stoichiometric formulae of the following solids [3 marks each, 9 total]: (i) The fluorite structure of calcium

6
5. (a) Give the stoichiometric formulae of the following solids [3 marks each, 9
total]:
(i) The fluorite
structure of calcium
fluoride, which
consists of a ccp
lattice
of cations, with anions
in all of the tetrahedral
interstitial sites.
(ii) The antifluorite
form of potassium
selenide, where a ccp
lattice of anions has all
of its tetrahedral sites
occupied by cations.
(iii) The body-centered
cubic structure of
cesium chloride, where
Cl' anions define a
simple cubic lattice
and Cs occupies the
centres of the unit
cells.

6 5. (a) Give the stoichiometric formulae of the following solids [3 marks each, 9 total]: (i) The fluorite structure of calcium fluoride, which consists of a ccp lattice of cations, with anions in all of the tetrahedral interstitial sites. (ii) The antifluorite form of potassium selenide, where a ccp lattice of anions has all of its tetrahedral sites occupied by cations. (iii) The body-centered cubic structure of cesium chloride, where Cl' anions define a simple cubic lattice and Cs occupies the centres of the unit cells.

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