Structure of multielectron atoms Chapter 1: The one electron atom Chapter2: Atoms with two or more electrons – symmetries Chapter3: Approximation methods Chapter4: The spin orbit interaction Chapter5: The central field approximation Chapter6: Coupling of angular momenta – the vector model Chapter7: LS–coupling Chapter8: jj coupling Chapter9: Other coupling schemes —Intermediate cases Chapter10: Nuclear effects Chapter11: The Zeeman effect Chapter12: The Stark effect Chapter13: Complex and exotic excitations Chapter14: Numerical solutions of the atomic Schrödinger equation Appendix A: Atomic units Appendix B: Radial hydrogenic wave functions Appendix C: Angular momentum Appendix D: Coulomb and Exchange integrals Appendix E: Electron spin Appendix F: Magnetic interactions in multielectron atoms Index. This book is about the structure of multielectron atoms and predominantly adopts a perturbative approach to the total Hamiltonian. A key concept is the central field approximation and beyond the standard LS coupling and jj coupling schemes intermediate cases are also treated. After that the book covers hyperfine structure and other nuclear effects as well as interactions with static external fields. Throughout the book an analytical approach is adopted. Working knowledge of basic quantum mechanics (including the non relativistic hydrogen atom basic angular momentum and perturbation theory) is assumed and it begins with a brief recap of the hydrogen orbitals before turning towards the symmetry aspects of multi electron atoms spin orbit interaction and couplings of angular momenta.