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i) The crystal structure of Lithium Selenide, Li2Se, is an antifluorite structure, which has anions in the fcc close-packed structure with Li cations occupying all 8 tetrahedral positions. Draw the structure and calculate the density of Li2SSe. The atomic weights are: AL=6.941g/mol and As=87.97g/mol. The ionic other Selenium atoms but that they do touch Lithium atoms. (20 points) ii) What is the maximum radius of a cation which can be accommodated in the vacant interstice of the anion array of LizSe? (10 points)