Answer
The larger balls must represent Sodium ion as it is larger (227 pm) as compared to that of Cl ion (181 pm).
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 8 - Basic Concepts of Chemical Bonding - Exercises - Page 334: 8.3a
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