Chemistry: Principles and Practice (3rd Edition)

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

Chapter 2 - Atoms, Molecules, and Ions - Questions and Exercises - Exercises - Page 86: 2.77


(a) I$^{1-}$ (b) Mg$^{2+}$ (c) O$^{2-}$ (d) Na$^{1+}$

Work Step by Step

(a) I$^{1-}$ The elemental symbol for iodine is I. Iodine is in group 17; therefore, it has a valence of 1-. (b) Mg$^{2+}$ The elemental symbol for magnesium is Mg. Magnesium is in group 2; therefore, it has a valence of 2+. (c) O$^{2-}$ The elemental symbol for oxygen is O. Oxygen is in group 16; therefore, it has a valence of 2-. (d) Na$^{1+}$ The elemental symbol for sodium is Na. Sodium is in group 1; therefore, it has a valence of 1+.
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