Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 8 - Periodic Relationships Among the Elements - Questions & Problems - Page 363: 8.82

Answer

$O^{+}$ and $N$. $Ar$ and $S^{2-}$. $Ne$ and $N^{3-}$ $Zn$ and $As^{3+}$. $Xe$ and $ Cs^{+}$

Work Step by Step

Atoms or ions with the same number of electrons are called iso-electronic species. $O^{+}$ and $N$. The atomic number of Oxygen = 8. $O^{+}$ is formed by the removal of one electron from an Oxygen atom. Therefore number of electrons in $O^{+}$ = 7. The atomic number of Nitrogen = 7. Therefore number of electrons in $N$ = 7. $Ar$ and $S^{2-}$. The atomic number of Argon = 18. Therefore number of electrons in $Ar$ = 18. The atomic number of Sulphur = 16. $S^{2-}$ is formed by the addition of two electrons to the Sulphur atom. Therefore number of electrons in $S^{2-}$ = 18. $Ne$ and $N^{3-}$ The atomic number of Neon = 10. Therefore number of electrons in $Ne$ = 10. The atomic number of Nitrogen = 7. $N^{3-}$ is formed by the addition of three electrons to a Nitrogen atom. Therefore number of electrons in $N^{3-}$ = 10. $Zn$ and $As^{3+}$. The atomic number of Zinc = 30. Therefore number of electrons in $Zn$ = 30. The atomic number of Arsenic = 33. $As^{3+}$ is formed by the removal of three electrons from an Arsenic atom. Therefore number of electrons in $As^{3+}$ = 30. $Xe$ and $ Cs^{+}$ The atomic number of Xenon = 54. Therefore the number of electrons in $Xe$ = 54. The atomic number of Caesium = 55. $Cs^{+}$ is formed by the removal of one electron from a Caesium atom. Therefore number of electrons in $Cs^{+}$ = 54.
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