Number of $N a$ atoms present in the unit cell of $N a C l$ crystal is :

1

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2

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3

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4

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Solution

The correct option is D $4$
Number of Na atoms present in the unit cell of NaCl crystal is 4.
$C l^{-}$ ions form $c c p$ array and $N a^{+}$ ions occupy all octahedral holes.
There are 4 octahedral sites per unit cell in $c c p$ structure.
Note: $c c p$ stands for cubic close packing or face centered cubic structure.

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Number of Na atoms present in the unit cell of NaCl crystal is :

The correct option is D 4Number of Na atoms present in the unit cell of NaCl crystal is 4.Cl− ions form ccp array and Na+ ions occupy all octahedral holes.There are 4 octahedral sites per unit cell in ccp structure.Note: ccp stands for cubic close packing or face centered cubic structure.

Number of $N a$ atoms present in the unit cell of $N a C l$ crystal is :