THE ORGANIZATION OF THE NATURE OF SCIENCE IS EMPHASIZED THROUGH A FOCUS ON CHEMICAL REACTIONS. SIMILARITIES OF THE REACTIONS OF THE HALOGENS WITH THE ALKALI METALS OF LITHIUM, SODIUM, POTASSIUM, AND HYDROGEN ARE INTRODUCED TO THE STUDENT. STUDENTS ARE INTRODUCED TO THE PERIODIC TABLE OF ELEMENTS WHICH EMPHASIZES THE ORGANIZATION OF CHEMICAL ELEMENTS INTO GROUPS SHARING LIKE PROPERTIES. CONCEPTS OF THE ATOMIC THEORY ARE DISCUSSED IN RELATION TO THE PERIODIC TABLE OF ELEMENTS. THE CONCEPTS INCLUDE THE STRUCTURE OF AN ATOM, POSITIVE NEGATIVE CHARGES, ELECTRONS, PROTONS, NEUTRONS, MASS, NUCLEUS, ATOM PARTICLES, SIZE, ATOMIC NUMBER, AND MASS NUMBER.