This is a two-part curriculum package for teaching the structure of atoms. The first part--the Teacher's Guide--contains information necessary for using the equipment in a typical classroom including learning goals, vocabulary, math skills, and sample data for each activity. The second part of the package consists of photocopy masters for a set of student activity guides, a cut-and-paste quiz builder, and scoring rubrics for assessment of those activities. The photocopy masters are designed for copy and use in the classroom. Most experiments have three skill levels to accommodate students from a wide range of grades and abilities. Level A activities lead students through a basic understanding of atomic structure and atomic bonding. Students learn about the role of atoms as nature's building blocks. In Level B, the same concepts are introduced as in Level A but at an accelerated pace and in greater depth. Both levels use the Atom Building Game to reinforce concepts through visualization and manipulation. Level C builds on concepts introduced in Level B, with atomic and nuclear applications: atomic spectra and nuclear decay. The Activity Guides are written to provide a framework for encouraging students to observe and learn science process skills as well as content. (PVD)