The Solid State - Result Question 21

####21. Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell of lithium is 351pm, the atomic radius of the lithium will be:

[2009]

(a) 151.8pm

(b) 75.5pm

(c) 300.5pm

(d) 240.8pm

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Solution:

  1. (a) Since lithium metal crystallises in a body centred cubic crystal

r=a34=351×1.7324=151.98pm



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