This graphic of the periodic table is a great way to help students remember the seven diatomic molecules. By simply looking at the periodic table students can easily remember the pattern that shows the location and the saying "start with seven make a seven and add the seventh one" provides to identify the seven diatomic molecules. Student quickly catch on to which elements are diatomic and where they are located on the periodic table. It has really worked well for my students. This graphic is part of a personal Chemistry Lab Reference Note book that I have each of my students make at the beginning of the year. See other products that help students with Chemistry at my Chemlan Chemistry Class Store.