This PDF document can be printed or used as a presentation with students to introduce or review Bohr Atomic Models. Especially useful for understanding valence electrons and practicing Lewis dot structures. Excellent review or teaching tool for high school Chemistry and Biology. I find this presentation extremely useful in Biology as a quick way to introduce students to the structure of an atom so that they can understand bonding and ions before jumping into biochemistry. One of my favorite resources, thought it would be highly useful for some of you out there. Includes a guide to the slides and two slides on valence electrons and electron orbitals.