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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

`1`

B

`0.5`

C

`3`

D

`4`

Text Solution

Verified by Experts

The correct Answer is:
B
For bcc, `Z_("eff") = 2//"unit cell"`
For fcc, `Z_(eff) = 4//"unit cell"`
`:.` Ratio `= 2/4 = 0.5`
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