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 $351 pm$, the atomic radius of the lithium will be:
[2009]
(a) $151.8 pm$
(b) $75.5 pm$
(c) $300.5 pm$
(d) $240.8 pm$
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Solution:
- (a) Since lithium metal crystallises in a body centred cubic crystal
$\therefore \quad r=\frac{a \sqrt{3}}{4}=\frac{351 \times 1.732}{4}=151.98 pm$
