Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson
ISBN 10: 0133942651
ISBN 13: 978-0-13394-265-1

Chapter 42 - Nuclear Physics - Conceptual Questions - Page 1235: 1

Answer

a) ${^{16}O}$ and ${^{18}O}$, ${^{18}Ne}$ and ${^{20}Ne}$ b) ${^{18}O}$, ${^{18}F}$ and ${^{18}Ne}$ c) ${^{16}O}$ and ${^{18}O}$, ${^{18}Ne}$ and ${^{20}Ne}$ d) ${^{18}O}$ and ${^{20}Ne}$, ${^{16}O}$ and ${^{18}Ne}$

Work Step by Step

a) Atomic number of isotopes are same, but they differ in mass number. ${^{16}O}$ and ${^{18}O}$ have same atomic number, but differ in atomic mass. Hence they are isotopes and as is the case with ${^{18}Ne}$ and ${^{20}Ne}$. b) Atoms of different elements having different atomic number but same mass number are called isobars. That is, ${^{18}O}$, ${^{18}F}$ and ${^{18}Ne}$ are isobars. c) ${^{16}O}$ and ${^{18}O}$ will have the same chemical properties. Because atoms of the same element have the same chemical properties. Due to the same reason, ${^{18}Ne}$ and ${^{20}Ne}$ will also have the same chemical properties. d) number of neutrons (n) = Mass number (A)-Atomic number (Z) Using this formula, we find that ${^{18}O}$ and ${^{20}Ne}$ have the same number of neutrons. Similarly, ${^{16}O}$ and ${^{18}Ne}$ have the same number of neutrons.
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