Atomic and Quantum Physics carefully and clearly introduces the results and methods of empirical atomic physics, while also conveying the tools of quantum theory and particularly highlighting the interaction between experiment and theory. This edition includes extensive updates and new sections on the quantum mechanical treatment of the atom in magnetic and electric fields. Additionally, the chapter "Advances in Quantum Physics: Deeper Understanding and New Applications" provides detailed explanations of the entanglement of wave functions, the Einstein-Podolsky-Rosen paradox, Bell's inequalities, the Schrödinger's cat paradox, and the concept of decoherence. The final chapter introduces the fundamentals of the quantum theory of chemical bonding, which is further explored in the authors' second volume "Molecular Physics and Q.