Answer
Na is further left and therefore has the larger atomic size.
Work Step by Step
Atomic size increases as period number increases. Within a period, atomic size decreases as you move right.
Na and Cl are in the same period.
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 4 - Section 4.7 - Trends in Periodic Properties - Questions and Problems - Page 125: 4.51a
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