AIPMT MAINS2009Chemistry-Solid State
AIPMT MAINS 2009 Chemistry Crystal Lattices MCQ Question
Type: MCQ-numerical-Medium
Copper crystallises in a face-centred cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm?
A
157
B
181
C
108
D
128
Correct Answer
Option D
Detailed Explanation
In a face-centred cubic lattice, the relation between the edge length (a) and the atomic radius (r) is a = 2√2r. Solving for r, we get r = a/(2√2) = 361/(2√2) ≈ 128 pm.
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