BRIGHT Teacher Atom is the perfect demonstration model for your whiteboard the unique magnetic model is ideal for presenting the abstract concepts of atomic structure isotopes and ions to the class. All parts of the product except for the storage board are magnetic and separated from each other allowing you to use only the parts needed for each situation.Includes instruction sheet.Contents:2 atomic nuclei8 electron shells20 protons20 neutrons20 electronsUse it to demonstrate the formation of 2 atoms or 1 ionEasy fun and efficient.