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 - Cumulative Problems - Page 82: 103

Answer

${^{236}_{90}Th},\ {^{234}_{88}Ra},\ {^{237}_{91}Pa},\ {^{238}_{92}U} $

Work Step by Step

The number of neutrons in an isotope is computed using the formula $N= A-Z$. Thus, ${^{236}_{90}Th}$ has $236-90 =146$ neutrons. Examples of isotones are ${^{234}_{88}Ra}, {^{237}_{91}Pa}, {^{238}_{92}U}$ since each has 146 nuetrons.
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