The third year of the Portland Project, a three-year secondary school curriculum in integrated science, consists of four parts, the first two of which are covered in this student guide. The reading assignments for part one, "Waves and Particles," are listed in the student guide and are to be read in the Harvard Project Physics textbook. The assignments relate to these topics: waves, light, electricity and magnetic fields, Faraday and the electrical age, electromagnetic radiation, the chemical basis of atomic theory, electrons and quanta, the Rutherford-Bohr model of the atom, and some ideas from modern physical theories. Topics for part two, "The Orbital Atom," are read from the Chemical Educational Materials Study (CHEMS) textbook and include: many-electron atoms, ionization energy and the periodic table, molecules in the gas phase, and the bonding in solids and liquids. In addition to the reading assignment lists, the student guide contains two major entries: an experiment on optics dealing with reflection, refraction, images and related factors; and an extensive discussion of the electron structure and related quantum properties of the orbital model of the atom. A review of the development of the three-year program, a discussion of its rationale and the content of each of the three courses, and a three-year course subject outline are included. (For more information on the Portland Project see SE 013 702, SE 013 703, SE 013 704, and SE 013 706.) (PR)