In which of the following crystals are all th | vedclass

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(D) In the $ZnS$ (zinc blende) structure,$S^{2-}$ ions form a $ccp$ (cubic close packing) lattice.
There are $4$ $S^{2-}$ ions per unit cell.
The nu

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$Na_2O$

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(D) In the $ZnS$ (zinc blende) structure,$S^{2-}$ ions form a $ccp$ (cubic close packing) lattice.
There are $4$ $S^{2-}$ ions per unit cell.
The number of tetrahedral voids is $2 	imes (	ext{number of atoms}) = 2 	imes 4 = 8$.
In $ZnS$,$Zn^{2+}$ ions occupy half of the tetrahedral voids,so $4$ tetrahedral voids are occupied.
In the $Na_2O$ (antifluorite) structure,$O^{2-}$ ions form a $ccp$ lattice.
There are $4$ $O^{2-}$ ions per unit cell.
The number of tetrahedral voids is $8$.
In $Na_2O$,$Na^{+}$ ions occupy all $8$ tetrahedral voids.
Therefore,in $Na_2O$,all tetrahedral voids are occupied.

In which of the following crystals are all the tetrahedral voids occupied?

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