Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Practice and Problem-Solving Exercises - Page 35: 63



Work Step by Step

The problem tells us that an ion has a charge of the sum of its protons and electrons. It tells us the proton charge is +1, and that the electron charge is -1. Since we have 18 electrons, we have a total of 18 -1 charges, which is 18*(-1). Since we have 16 protons, we have a total of 16 +1 charges, which is 16*1. Adding these together, we get (18*(-1)+16*1) = -18+16 = -2. So, the charge of the sulfur ion is -2.
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