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Tungsten crystallises in a body centred ...

Tungsten crystallises in a body centred cubic unit cell. If the edge of the unit cell is 316.5 pm, what is the radius of tungsten atom ?

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The correct Answer is:
137 pm
For a body centred cubic unit cell (bcc)
Radius `(r)=(axxsqrt3)/(4)=((316.5"pm")xxsqrt3)/(4)="137 pm".`
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