Chemistry: Molecular Approach (4th Edition)

Published by Pearson
ISBN 10: 0134112830
ISBN 13: 978-0-13411-283-1

Chapter 2 - Exercises - Page 81: 103


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Isotones are those chemical species which contains same number of neutrons. The number of protons in thorium is 90. Calculate the number of neutrons as follows: \[\begin{align} & \text{Number of neutrons}=\text{Mass number}-\text{Number of protons} \\ & =236-80 \\ & =146 \end{align}\] The elements having same number of neutrons are \[^{237}\text{Pa}\], \[^{238}\text{U}\], \[^{239}\text{Np}\], and \[^{240}\text{Pu}\].
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