When students construct the periodic table in this activity, they will see
the patterns that exist in the table without you saying anything. These cards depict Bohr Diagrams for elements #1-20 of the periodic table. This activity is great to use once your students understand that the “identity” of an atom can be determined by its number of protons, and that in a neutral atom the protons equal the electrons. It also aligns nicely with NGSS Standard HS-PS1-1
(Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms), but I also use it with my 8th graders in our chemistry unit.
Print one set of these five pages per group, preferably in color. Laminate if desired (mine are not laminated and it works out fine). Cut apart pieces. I suggest labeling the back of each piece in a set with a number in case of mix-ups! Place the Bohr diagrams and element names in one sandwich bag (students will use first). Place the number of valence electrons and number of shells cards in another sandwich bag (students will use second).
Begin the activity by reading the short passage on the student sheet and then have students work through questions #1 – 14 to activate prior knowledge and let them work out which particle is which on the diagrams. Then, hand out the Bohr diagrams/element names bags.
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! Students answer the Follow-Up questions as an assessment of their understanding.
These manipulatives would work fine in black and white, but they are great in color for the visual learners. I find that this activity really sticks with the students and I am able to build on this later!
A great follow-up graphic organizer for this activity is my Periodic Personalities : A Periodic Table Graphic Organizer
, and/or as an activity to introduce how the members of the periodic table's groups are related to one another, my Element Families of the Periodic Table Informational Text Activity
Thanks for looking!