Chemistry: Principles and Practice (3rd Edition)

Published by Cengage Learning
ISBN 10: 0534420125
ISBN 13: 978-0-53442-012-3

Chapter 21 - Nuclear Chemistry - Questions and Exercises - Exercises - Page 933: 21.20


(a) 1.13 (b) 1.45 (c) 1.23 (d) 1.36 (e) 1.51

Work Step by Step

The number of neutrons (N) = A-Z where A is the mass number and Z is the atomic number. The number of protons (P)= Z where Z is the atomic number. Therefore, the neutron-to-proton ratio $(\frac{N}{P})$ is given by the expression $\frac{N}{P}=\frac{A-Z}{Z}$. (a) $\frac{N}{P}=\frac{A-Z}{Z}=\frac{17-8}{8}=1.13$ (b) $\frac{N}{P}=\frac{93-38}{38}=1.45$ (c) $\frac{N}{P}=\frac{67-30}{30}=1.23$ (d) $\frac{N}{P}=\frac{118-50}{50}=1.36$ (e) $\frac{N}{P}=\frac{196-78}{78}=1.51$
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