The Solid State - Result Question 20

####20. Copper crystallises in a face-centred cubic lattice with a unit cell length of 361pm. What is the radius of copper atom in pm?[2009]

(a) 157

(b) 181

(c) 108

(d) 128

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Solution:

  1. (d) Since Cu metal crystallises in a face centred cubic lattice

r=a22

r=36122=127.6128pm



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