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

-2

#### Work Step by Step

Since there are 18 electrons which have a charge of -1, the total negative charge is $18(-1)$. Since there are 16 protons which have a charge of +1, the total positive charge is $16(1)$. Add the positive and negative charges to find the ion's charge. $18(-1)+16(1)\longrightarrow$ multiply $=-18+16\longrightarrow$ add $=-2$

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