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In each of the compounds : NaCl, ZnS and...

In each of the compounds : NaCl, ZnS and ` CaF_(2)` ,
Write (i) ions occupying the voids (ii) types of voids occupied (iii) fraction of voids occupied.

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(a)`NaCl=Na^+` ions in all the octahedral voids
(b)`ZnS=Zn^(2+)` ions in alternate tetrahedral voids
(c ) `CaF_2=F^-` ions in all the tetrahedral voids.
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