sentence2_structure: objects<>are<>atomic/subatomic$$$The specialized study of the motion of objects<>is called<>quantum mechanics
sentence1: Topics covered include the special theory of relativity, theory for a one-electrom atom, and x-ray spectra, a study of the subatomic particles, assemblies of particles, mass spectra, bonding energies, photoelectric effect, Compton effect, pair production and quantum mechanics.
sentence2: The specialized study of the motion of objects that are atomic/subatomic in size is called quantum mechanics.
question: The specialized study of the motion of objects that are atomic/subatomic in size is called what?