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Copper crystallises in fcc with a unit c...

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

A

181 pm

B

108 pm

C

128 pm

D

157 pm

Text Solution

Verified by Experts

The correct Answer is:
B
In fcc unit cell 4r `=sqrt(2)a`
[ r = radius of Cu atom a = edge length ]
So, `r=(sqrt(2a))/(4)rArrr=(sqrt(2)xx361)/(4)=127` pm
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