If the distance between Na^{+} and Cl^{-} ion | vedclass

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(D) In a $NaCl$ crystal (fcc structure), the distance between the cation $(Na^{+})$ and the nearest anion $(Cl^{-})$ along the edge of the unit cell i

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$2X \ pm$

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(D) In a $NaCl$ crystal (fcc structure), the distance between the cation $(Na^{+})$ and the nearest anion $(Cl^{-})$ along the edge of the unit cell is equal to half of the edge length $(a)$.Given that the distance between $Na^{+}$ and $Cl^{-}$ is $X \ pm$, we have:$X = a/2$Therefore, the edge length of the unit cell is:$a = 2X \ pm$Thus, the correct option is $(D)$.

If the distance between $Na^{+}$ and $Cl^{-}$ ions in sodium chloride crystal is $X \ pm$, the length of the edge of the unit cell is

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