Answer
Atomic weight is the average of all naturally occurring isotopes of an element.
Work Step by Step
This is a weighted average based on prevalence and atomic mass of each isotope and will not come out to a whole number.
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 - Challenge Questions - Page 131: 4.106d
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