Answer
220 pm
Work Step by Step
For an fcc unit cell,
Face diagonal= $4\times(radius)=\sqrt {2}\times(edge)$
$\implies radius= \frac{\sqrt {2}\times(edge)}{4}$
$=\frac{\sqrt {2}\times620\,pm}{4}=220\,pm$
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 9 - Liquids, Solids, and Materials - Questions for Review and Thought - Topical Questions - Page 421c: 59
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