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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

108 pm

B

127 pm

C

157 pm

D

181 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(2)a)/4 rArr r = (sqrt(2) xx 361)/4 = 127` pm
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