Write the co-ordination number of each ion in the following crystals.

N a C l

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C s C l

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Z n S

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C a F_{2}

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N a_{2} O

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Solution

The correct option is B $N a C l$
$N a C l ⟶ 6$ (each $N a$ is surrounded by $6$ $C l^{-}$ )
Cation occupies half of the tetrahedral voids; anion forms FCC.
$C s C l ⟶ 8$ (each $C s$ is surrounded by $8 C l^{-}$ )
Cation occupies body center, anion forms BCC
$Z n s ⟶ 4$ Cation occupies alternate tetrahedral voids; anion forms FCC.
$C a F_{2} ⟶ 4$ Cation occupies alternate body center; anion forms BCC.

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