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3.10 Show that the minimum cation-to-anion radius ratio for a coordination number of 4 is 0.225....

3.10 Show that the minimum cation-to-anion radius ratio for a coordination number of 4 is 0.225.
3.12 On the basis of ionic charge and ionic radii, predict crystal structures for the following materials: (a) CaO (b) KBr. Justify your selections.

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multiple questions I am allowed to solve only one question at a time.

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