Q1)What is the coordination no. of each type of ions in a rock-salt type crystal structure? how?

 NaCl has fcc structure. In this structure, each Na+ ion is surrounded by 6 Cl- ions and vice-versa. So the co-ordination number of both Na+ ions and Cl- ions is 6. 

Na+ : Cl- = 6:6  is the cn.   refer  diag. for better understanding

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