Header and Subheader
vertical spacer
TrendsTube ® horizontal spacer (3D Forever owners have permission to use this.)
This chart is wrapped and joined like the Main Group on the 3D Forever AAE, hence the name.
Like his slant of the databoxes of the 3D AAE, Roy Alexander did the same here, allowing the end of one period to be directly adjacent to the beginning of the next. This feature uniquely provides greater clarity to the inter-relationship of ionization energy of the elements before and after the Noble Gas elements, being together, instead being found at opposite ends of the flat periodic chart.
Interactivity: teacher download and print, student wrap, tape, and understand.
Alexander 2017
vertical spacer
CoValenTool ® horizontal spacer (3D Forever owners have permission to use this.)
Another downloadable interactive device is this unique creation by Roy Alexander.
It is designed to show which families of the Main Group elements share electrons to form compounds - useful during the lesson, and as a later reference. It also calls attention to the inert nature of the Noble Gases. After students cut and fold, and fold, and fold, etc., the position of elements that can share electrons may be moved to direct proximity. It illustrates that any elements of the adjacent group can form a simple two element compound, clarified by the relative positioning of valence shell electrons (a variant ot Lewis Dots) of all adjacent elements.
Using the old IUPAC Roman numeral column numbers lets the students to see immediately the number of electrons that are available in the valence shell of that column.
Alexander 2017
vertical spacer


4851 N. Washtenaw Ave., Chicago, IL 60645    773.271.0318
last update 5/20/16