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Question

Copper crystallizes in a face-centered cubic lattice with a unit cell length of 361 pm. What is the radius of copper atoms in pm?

A
157
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B
181
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C
108
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D
128
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Solution

The correct option is D 128
Since Cu crystallizes in a face-centered cubic lattice,
Atomic radius,
r=a22
Where, a = Edge length = 361 pm
r=36122
=127.6128 pm

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