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- All of the atoms have the same atomic radius. What is the coordination number of any Mg atom in this structure?
- Orient the stucture so that you are looking down the c-axis. You should see a repetition of the Mg atoms along the a-axis. What is the stacking arrangement of the layers (ABCABC, or ABAB) along the a-axis? Is this a cubic close packed (CCP) or hexagonal close packed (HCP) structure?
- Looking down on the planes of atoms you see hexagonal rings connected to form a network.
What happens if we rotate these planes? Remember to consider the atoms shown in this view as part of an infinite plane of atoms. Rotate the the structure 120°. Do similar atoms occupy exactly the same positions, or are they in a different arrangement? Try the same with a 90° and 180° rotation.