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Sodium metal crystllizes in a body centr...

Sodium metal crystllizes in a body centred cubic lattice with a unit cell edge of `4.56Å`. The radius of sodium atom is approximately

A

`5.72 Å`

B

`1.98Å`

C

`1.86 Å`

D

`3.22 Å`

Text Solution

Verified by Experts

The correct Answer is:
C
For bcc, `r=sqrt(3)/4 a`
`r=sqrt(3)/4xx(4.29Å)=1.86Å`
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