This interactive animation gives students a taste of atomic/molecular structure by exploring four elements: oxygen, neon, bromine, and iodine. These elements were chosen because they represent four very different structures — a noble gas (neon), a diatomic gas molecule (oxygen), a diatomic liquid molecule (bromine), and a diatomic solid molecule (iodine). Each element is represented in illustrations and animations that model the molecular motion. The periodic table may be displayed simultaneously to help students accurately answer the question sets. It can be adapted for use in either high school or middle school. See Related Materials for a Power Point presentation by the same author that nicely supplements this activity. This collection is part of An Introduction to Chemistry, a set of resources developed by Mark Bishop which includes two textbooks, 15 animated tutorials, downloadable Power Point presentations for teachers, concept maps, and 3D molecular models.