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.