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If the distan...

Question

If the distance between $N a^{+}$ and $C l^{-}$ ions in an NaCl crystal is 'a' pm, what is the length of the cell edge?

2 a

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\frac{a}{2}

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4 a

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\frac{a}{4}

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Solution

The correct option is A $2 a$
Given the distance between $N a^{+}$ and $C l^{-}$ ions in $N a C l$ crystal is a.
So the length of edge, $= 2 (N a^{+} + C l^{-}) = 2 a$

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If the distance between $N a^{+}$ and $C l^{-}$ ions in NaCl crystal is $α$ pm, the edge length of the unit cell is:

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