The Bohr Model of the Hydrogen Atom Niels Bohr's Analysis of the Quantum States of an Electron in an Atom The Simple Version of the Bohr Model of the Hydrogen Atom A Generalization of Neils Bohr's Model of Quantization A Generalization of Neils Bohr's Model of Quantization for the Relativistic Case The Relativistic Bohr Model of a Hydrogen-like Atom A Universal Quantization Condition for Circular Orbit Radii in Two-Particle Systems