Question

If the distance between $N{a}^{+}$ and $C{l}^{-}$ in $NaCl$ crystal is $265pm$, the edge length of the unit cell will be:

• A. 265 pm
• B. 795 pm
• C. 132.5 pm `
• D. 530 pm

Answer 1

The correct option is D 530 pm

For $NaCl$ crystal,

$a=2\times rwhere{}^{\prime }{a}^{\prime }isedgelengthand{}^{\prime }{r}^{\prime }distancebetweenatomsa=2\times 265a=530pm$.

Hence, correct answer is option D.