Question

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

A
300.5 pm
B
240.8 pm
C
151.98 pm
D
75.5 pm

Solution

## The correct option is C 151.98 pmIn case of BCC crystal , $$a \times \sqrt 3 =4r$$ Hence , atomic radius of lithium,$$r=\dfrac {a\times\sqrt3}{4}$$= $$\dfrac{ 351\times 1.732}{4}$$= 151.98 pmSo option C is correct.Chemistry

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