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Sodium metal crystallizes in body centered cubic lattice with cell edge = 4.29 Å. What is the radius of sodium atom?

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Sodium metal crystallizes in body centered cubic lattice with cell edge = 4.29 Å. What is the radius of sodium atom? 

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Given: Edge length of unit cell (a)

= 4.29 Å

To find: Radius (r) =? 

Formula: Radius (r) = √3a/4

Calculation: 

For BCC 

From formula,

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