Answer
Argon-40
Work Step by Step
The atomic mass of Argon is 39.95 so when we round the mass, we get 40. Thus the most abundant isotope is Argon-40
Chemistry (12th Edition)
by Wilbraham
Published by
Prentice Hall
ISBN 10:
0132525763
ISBN 13:
978-0-13252-576-3
Chapter 4 - Atomic Structure - 4.3 Distinguishing Among Atoms - 4.3 Lesson Check - Page 119: 33
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