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Sodium metal crystallises in body centre...

Sodium metal crystallises in body centred cubic lattic with the cell edge, 4.29 Å . What is the radius of radius of sodium atom ? What is the length of the body dioganl of the unit cell ?

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For body centred cubic lattice, the relationship between the cell edge (a) and the radius of the atom is
`r=sqrt3/4a=1.732/4xx4.29`=1.86 Å
Length of the body diagonal =4r =4 x 1.86 Å=7.44 Å
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