structure of ionic compound

State two important factors responsible for a certain crystal structure in ionic compounds

Ionic compounds

Which of following statements is correct in the zinc-blende-type structure of an ionic compound?

In a close packed structure of an ionic compound anions B form the close packed lattice and the cations A occupy octahedral voids.Predict the formula of the compound.

In A^(+)B^(-) ionic compound, radii of A^(+)andB^(-) ions are 180 pm and 187 pm respectively. The crystal structure of this compound will be:

In A^(+)B^(-) ionic compound radii of A^(=) and B^(-) ions are 180 "pm " and 187 pm respectively .The crystal structure of this compound will be

Which of the following statement is/are incorrect in the rock-salt structure if an ionic compounds ? (A) coordination number of cation is four where as that of anion is six. (B) coordination number of cation is six where as that of anion is four. (C) coordination number of each cation and anion is four. (D) coordination number of each cation and anion is six.