Study of the structure of the atomic nucleus (atomic theory, proton-electron model in the atomic nucleus, discovery of neutrons, proton-neutron model in the atomic nucleus), radioactivity (alpha, beta particles and gamma rays), the law of decay of radioactivity (half-life, average life -average, law of disintegration, equilibrium radioactivity), Alpha Decay (spontaneous decay, measurement of energy in alpha particles, range and ionization, stopping power theory), Beta decay (spontaneous emission, measurement of energy in beta particles, loss of energy in electrons, absorption systems and the neutrino and antineutrino hypothesis), Gamma Radiation (absorption coefficient on photons, interaction of gamma radiation with matter, measurement of the absorption coefficient and energy of gamma rays, gamma emission theory), Nuclear reactions (energy conservation in nuclear reactions, nuclear reactions in the center of mass coordinate system , threshold energy in endoergic reactions, measurement of Q values, cross section, relationship between cross section in CMCS and LAB coordinate system), Fission and Fusion Reactions and elementary particles.