Use this investigation of the first 20 elements of the Periodic Table to illustrate the core concepts of atomic theory. This selection of element cards that stick to the black or white board is designed to minimize the extra information while focusing on essential points. This allows students to become active learners as they discover the concepts and trends as they sequentially build the table. The cards can be used to illustrate several major concepts including Families and Periods, Atomic Number and Mass, Electron Shells and Valency, and Isotopes. This set includes elements 1-20, blank cards, Hydride (H-), 3 Mg Isotopes, Au and Pb. Teacher's notes also included. Grade 7 +.