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Sodium crystallises in a body-centred cu...

Sodium crystallises in a body-centred cubic unit cell. (bcc) with edge length `4.29Å`. What is the radius of the sodium atom ? What is the length of the body-diagonal of the unit cell?

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For a body centred cubic unit cell (bcc)
Radius (r) =`(axxsqrt3)/(4)=((4.29Å)xx1.732)/(4)=1.86Å`
Length of the body diagonal `=4pi=4xx1.86=7.44Å`
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