Question

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

Answer 1

d 127 is the correct answer

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Answer 2

(d) 128

Explanation:

Given unit cell length = a = 361 pm

For Face centered cubic: a = 2√2 r. So r = a / 2√2

r = 361/ 2√2 = 127.65 pm

Among the given options, the closest value is 128 pm.

Hence Option D is the answer.