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

Option 1)
75 pm

Option 2)
300 pm

Option 3)
240 pm

Option 4)
152 pm

Answers (2)

$a= 351 pm$

$For\: bcc \: unit \: cell, a\sqrt{3}= 4r$

$r= \frac{a\sqrt{3}}{4}= \frac{351\times \sqrt{3}}{4}= 152pm$

Option 1)

75 pm

Option 2)

300 pm

Option 3)

240 pm

Option 4)

152 pm

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Vakul

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