Chemistry: Atoms First (2nd Edition)

Published by Cengage Learning
ISBN 10: 1305079248
ISBN 13: 978-1-30507-924-3

Chapter 5 - Exercises - Page 240c: 37


The average atomic mass of this element is 207.2 u. The element is Lead, represented by the symbol: Pb.

Work Step by Step

1. Calculate the average atomic mass of the element: $$( 0.0140 )( 203.973 \space u)+( 0.2410 )( 205.9745 \space u)+( 0.2210 )( 206.9759 \space u)+( 0.5240 )( 207.9766 \space u)=207.2 \space u$$ 2. Use a periodic table to identify the element with average atomic mass equal to 207.2 u. - It is Pb: Lead.
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