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Question

Copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom?


A
127 pm
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B
157 pm
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C
181 pm
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D
108 pm
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Solution

The correct option is B 127 pm
For FCC , relationship between radius(r) and unit cell length(a) is : 
r = $$\dfrac{a}{2\sqrt{2}}$$
a = 361 pm ,
Hence , r = $$\dfrac{361}{2\sqrt{2}}$$
r = 127 pm

Chemistry

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