The purpose of this lab is for students to apply what they know about physical properties and periodic trends to predict ”What Are the Densities of Germanium and Flerovium?” The Teacher Notes provide the connections to standards, a timeline, safety notes, information on materials and preparation, and instructions for facilitating the lesson and assessing student outcomes. After the Teacher Notes, you will find a Lab Handout and Checkout Questions. Before beginning the lesson, we recommend reading Chapters 1 and 2, which are included in this book selection. Chapter 1 provides an overview of Argument-Driven Inquiry (ADI) with an explanation of what happens during each of the eight stages of ADI, which are the same for every ADI investigation. Chapter 2 focuses on the lab investigations that were designed using the ADI instructional model. The investigations are not meant to replace an existing curriculum but rather to transform the laboratory component of a chemistry course. This book selection also includes Table of Contents, Preface, Acknowledgments, About the Authors, Introduction, Appendixes, Image credits, and Index.