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: 2.78


(a) K$^{1+}$ (b) Br$^{1-}$ (c) Ba$^{2+}$ (d) S$^{2-}$

Work Step by Step

(a) K$^{1+}$ The elemental symbol for potassium is K. Potassium is in group 1; therefore, it has a valence of 1+. (b) Br$^{1-}$ The elemental symbol for bromine is Br. Bromine is in group 17; therefore, it has a valence of 1-. (c) Ba$^{2+}$ The elemental symbol for barium is Ba. Barium is in group 2; therefore, it has a valence of 2+. (d) S$^{2-}$ The elemental symbol for sulfur is S. Sulfur is in group 16; therefore, it has a valence of 2-.
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