These are cards depicting Bohr Diagrams for elements #1-20 of the periodic table.
Print one set of these five slides per group, preferably in color. Laminate if desired (mine are not laminated and it works out fine). Cut apart pieces. I suggest labeling each set with a number in case of mix-ups! Place the Bohr diagrams and element names in one sandwich bag. Place the number of valence electrons and number of shells cards in another sandwich bag.
The students first arrange the diagrams and their corresponding element names into the periodic table (#1-20) shape. Then, they add to that the cards containing the correct number of valence electrons and the correct number of shells/energy levels for each element.
I love listening to my students do this activity because they get it! I actually hear the "Eureka!"s in the room! These manipulatives would work fine in black and white, but they are great in color for the visual learners. After my students set up their table, I ask them to describe the patterns of periodicity that they see. How are a silicon atom and a carbon atom different? Similar? How are a magnesium atom and an aluminum atom different? Similar?
I find that this activity really sticks with the students and I am able to build on this later!
As a follow-up activity to introduce how the members of the periodic table's groups are related to one another, please check out my Element Families of the Periodic Table Informational Text Activity
Thanks for looking,