Atomic structure spectra, hydrogen spectrum; x-ray spectra, Moseley relations, interpretation of x-ray spectra;Alkali metals spectra, fine structure, electron spin; vector model of the atom. Magnetic moments, orbital spin, space quantization, spin-orbit coupling, total angular momentum, vector coupling, LS and JJ coupling. Zeeman effect; normal, anomalous, Lande’s Splitting factor, Zeeman splitting in high magnetic fields, Paschen-Back effect; Hyperfine splitting; stark effect.