Answer
The atomic mass is the average of all naturally occurring isotopes of Sr.
Work Step by Step
This is the weighted average of the prevalence of each isotope, along with each atomic mass.
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: 4.105d
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