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Lithium forms body centred cube structur...

Lithium forms body centred cube structure .The length of the side of its unirt cell is 351 pm Atomic radius of the lithium will be

A

240.8 pm

B

151.8 pm

C

75.5 pm

D

300.5 pm

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The correct Answer is:
B
In case of body centred cubic (bcc) crystal,
`asqrt3=4r`
Given, edge length, a=351 pm
Hence, atomic radius of lithium,
`r=(asqrt3)/(4)=(351xx1.732)/(4)`
`=151.98" pm"`
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