Formula sheet
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Midterm central

Chemistry Department
University of Alberta

Periodic Table of the Elements

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There are 3 cubic (isometric) lattices. These are:

1. Simple cubic
2. Body-centred cubic
3. Face-centred cubic

1. Zinc sulfide
   S^2- anions occupy all 14 of the fcc lattice points, and Zn²⁺ cations occupy 4 of the 8 tetrahedral holes.
2. Sodium chloride
   Ions of one type occupy all 14 fcc lattice points and all octahedral holes are filled by ions of the other type.