1.

Write the coordination number of each ion in the following crystals . (i) NaCl (ii) CsCl (iii) ZnS (iv) ` CaF_(2)` ( v) ` Na_(2)O`

Answer» `Na^(+) = 6, Cl^(-) =6 , (ii) Cs^(+) = 8, Cl^(-) = 8 (iii) Zn^(2+) = 4, S^(2-) = 4 (iv) Ca^(2+) = 8, F^(-) = 4 , (v) Na^(+) = 4, O^(2-) = 8 `


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