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Structural Isomerism

Na andMg crys...

Question

Na andMg crystallize inBCCandFCCtype crystals respectively, then the number of atoms of Na and Mg present in the unit cell of their respective crystal is
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A

4 and 2

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B

9 and 14

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C

14 and 9

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D

2 and 4

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Solution

The correct option is D
2 and 4

The bcc cell consists of 8 atoms at the corners and one atom at centre
\
The fcc cell consists of 8 atoms at the eight corners and one atom at
each of the six faces. This atom at the face is shared by two unit cells.
\

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