Chapter 4, Problem 4.83UTC

Interpretation Introduction

To indicate: If the atoms in each pair have the same number of protons, neutrons, or electrons.

$\text{a}\text{.}\text{C}\text{l,}\text{A}\text{r}$

$\text{b}\text{.}\text{S}\text{,}\text{S}$

$\text{c}\text{.}\text{A}\text{r,}\text{C}\text{l}$