The Solid State - Result Question 20
####20. 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?[2009]
(a) 157
(b) 181
(c) 108
(d) 128
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Solution:
- (d) Since $Cu$ metal crystallises in a face centred cubic lattice
$\therefore \quad r=\frac{a}{2 \sqrt{2}}$
$r=\frac{361}{2 \sqrt{2}}=127.6 \simeq 128 pm$
