Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 2 - Sections 2.1-2.9 - Exercises - Problems by Topic: 76


The mass of the element is roughly 140.116amu. By looking at our periodic table the element is Cerium.

Work Step by Step

To find the element that these four isotopes belong to, we must find the mean mass by multiplying all four masses by their abundances in a percentage decimal (i.e. 88% would be 0.88). Mean mass= ((135.90714)(0.0019)+(137.90599)(0.0025)+(139.90543)(0.8843)+(141.90924)(0.1113))= 140.116amu
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