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Relation Between r and a

If the distan...

Question

If the distance between $N a^{+}$ and $C l^{-}$ ions in $N a C l$ crystal is $X$ -pm, the length of edge of the unit cells (in pm) is:

\frac{X}{2}

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X

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2 X

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4 X

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Solution

The correct option is B $2 X$
In $N a C l$ ,

Edge length $= 2 (r_{N a}^{+} + r_{C l}^{-})$

$= 2 \times$ distance between $N a^{+}$ and $C l^{-}$ ions

$= 2 X$

Edge length $= 2 X$ .

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