Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 2 Atoms, Molecules, and Ions - 2-5 The Periodic Table - Case Study - Questions: 1

Answer

Oxygen: $n=10$ Lead: first isotope $n=124$ second isotope $n=122$

Work Step by Step

According to the periodic table, the atomic mass of oxygen is 8. From the question, oxygen isotope's mass number is 18. The number of neutrons is given by: $A=Z+n\rightarrow 18=8+n$ $n=10$ For lead (Pb), $Z=82$ in the first isotope $A=206\rightarrow n=124$ in the second isotope $A=204\rightarrow n=122$
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