The "Next Generation Science Standards" ("NGSS") emphasizes content and scientific practices, but what does this actually look like in a classroom? The "NGSS" integrates scientific and engineering practices with core ideas and crosscutting concepts, merging the three dimensions from "A Framework for K-12 Science Education" (NRC 2012). By engaging themselves in science, students understand how their knowledge develops, providing "an appreciation of the wide range of approaches that are used to investigate, model, and explain the world" (NRC 2012, p. 42). The "Framework" identifies eight scientific and engineering practices (NRC 2012). This article focuses on the practice of modeling as a tool to engage students in additional scientific practices: arguing from evidence, communicating ideas, and developing understanding of core ideas. The authors discuss how to support students in model building by having them develop, share, and discuss atomic models and then revise those models based on observed electrostatic interactions.