This document provides directions for building different atoms and isotopes using marshmallows, toothpicks, and spice drops to represent subatomic particles. It includes a chart to fill out with the number of protons, neutrons, and electrons as well as atomic mass for various atoms and isotopes including hydrogen, helium, lithium, beryllium, and boron. It also asks questions about isotopes, what the number after an element represents, how to determine neutrons in an isotope, and whether changing protons changes the element.