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Na and Mg crystallize in bcc- and fcc-ty...

`Na` and `Mg` crystallize in bcc- and fcc-type crystals, the ratio of number of atoms present in the unit cell of their respective crystal is

A

4 and 2

B

9 and 14

C

14 and 9

D

2 and 4

Text Solution

Verified by Experts

The correct Answer is:
D
In BCC (Na)
No. of atoms per unit cell `=8xx1//8+1=2`
In FCC. (Mg)
No. of atoms per unit cell `=8xx1//8+6xx1//2=4`
The number of atoms in unit cells are respectively 2 and 4
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