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Crystal Lattice and Unit Cell

In CaF2 lat...

Question

In $C a F_{2}$ lattice coordination number of $C a^{+ 2}$ & $F^{-}$ is :

A

4, 4

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B

8, 8

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C

4, 8

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D

8, 4

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Solution

The correct option is C $8, 4$
$C a^{+ 2}$ occupy at $F C C$ lattice site and $F -$ occupy at tetrahedral void so $C . N .$ of $C a^{+ 2} = 8$ and $F - C . N . = 4$

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