Unit VIII: Atoms and Nuclei

Alpha - particle scattering experiment; Rutherford’s model of atom; Bohr model, energy levels, hydrogen spectrum. Composition and size of nucleus, atomic masses, isotopes, isobars; isotones. Radioactivity – alpha, beta, and gamma particles/rays, and their properties; radioactive decay law. Mass- energy relation, mass defect; binding energy per nucleon and its variation with mass number; nuclear fission and fusion.