Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 77: 2.59d


Name: Potassium Sulfide Formula: K$_{2}$S

Work Step by Step

Potassium wants to get rid of 1 electron, Sulfur wants 2 electrons, therefore two ions are formed. K$^{+}$ and S$^{2-}$, hence you need 2 potassium ions for every one sulfur ion to keep the molecule neutral, therefore the formula is K$_{2}$S. When naming ionic compounds, the positively charged ion keeps its name and the negatively charged ion has its ending dropped and replaced with -ide. Hence, the name is Potassium Sulfide.
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